Now these kinds of sentences don't just show fluency, they show you. They tell your story and that's what really matters. Now let's talk about possibility. When you are not sure what will happen, but you want to express it. Alright? So use words like maybe, I might, I'm not sure, but I think. Here are a few examples. Maybe I'll go out tonight. I might study later or just rest. I'm not sure but I think I'll move next year.


Now let's talk about possibility. When you are not sure what will happen, but you want to express it. Alright? So use words like maybe, I might, I'm not sure, but I think. Here are a few examples. Maybe I'll go out tonight. I might study later or just rest. I'm not sure but I think I'll move next year. Now let's practice. Say something that you might do this weekend. Start with maybe I will


Here are a few examples. Maybe I'll go out tonight. I might study later or just rest. I'm not sure but I think I'll move next year. Now let's practice. Say something that you might do this weekend. Start with maybe I will And now try, I might. And now try, I'm not sure but I think I'll.


Now let's practice. Say something that you might do this weekend. Start with maybe I will And now try, I might. And now try, I'm not sure but I think I'll. See how natural that feels? You are now expressing certainty. You are now expressing certainty, plans, hopes and possibility. All in one lesson.


And now try, I might. And now try, I'm not sure but I think I'll. See how natural that feels? You are now expressing certainty. You are now expressing certainty, plans, hopes and possibility. All in one lesson. Now let's bring it all together. I'll go first and then you try. Tomorrow I'm going to work on a new project. I'll probably wake up early, have coffee and get started right away.


See how natural that feels? You are now expressing certainty. You are now expressing certainty, plans, hopes and possibility. All in one lesson. Now let's bring it all together. I'll go first and then you try. Tomorrow I'm going to work on a new project. I'll probably wake up early, have coffee and get started right away. In the evening, I might watch a movie or just relax. One day, I would love to travel to Japan. It's been a dream of mine for years.


Now let's bring it all together. I'll go first and then you try. Tomorrow I'm going to work on a new project. I'll probably wake up early, have coffee and get started right away. In the evening, I might watch a movie or just relax. One day, I would love to travel to Japan. It's been a dream of mine for years. Now your turn. Describe your future, maybe tomorrow, next week or a dream for someday. Start when you're ready. Alright?


In the evening, I might watch a movie or just relax. One day, I would love to travel to Japan. It's been a dream of mine for years. Now your turn. Describe your future, maybe tomorrow, next week or a dream for someday. Start when you're ready. Alright? That was great. Speaking about future lets people know what matters to you. Your plans, your energy, your direction.


Now your turn. Describe your future, maybe tomorrow, next week or a dream for someday. Start when you're ready. Alright? That was great. Speaking about future lets people know what matters to you. Your plans, your energy, your direction. So now let's review everything that we've learned.


That was great. Speaking about future lets people know what matters to you. Your plans, your energy, your direction. So now let's review everything that we've learned. Use going to for plans. Use will for decisions, promises and predictions. Talk about hopes and dreams with words like want to, hope to and would love to. And use maybe, might and I think for possibilities.


So now let's review everything that we've learned. Use going to for plans. Use will for decisions, promises and predictions. Talk about hopes and dreams with words like want to, hope to and would love to. And use maybe, might and I think for possibilities. Your mission this week is to talk about weekend plans, your goals and your dreams out loud. You can record yourself, say it to a friend or even write it down and read it out loud.


Use going to for plans. Use will for decisions, promises and predictions. Talk about hopes and dreams with words like want to, hope to and would love to. And use maybe, might and I think for possibilities. Your mission this week is to talk about weekend plans, your goals and your dreams out loud. You can record yourself, say it to a friend or even write it down and read it out loud. So here's a template for you to try. This weekend, I'm going to, I might, in the future I want to, one day I would love to.


Your mission this week is to talk about weekend plans, your goals and your dreams out loud. You can record yourself, say it to a friend or even write it down and read it out loud. So here's a template for you to try. This weekend, I'm going to, I might, in the future I want to, one day I would love to. Repeat it a few times with your own words. Let the language...


So here's a template for you to try. This weekend, I'm going to, I might, in the future I want to, one day I would love to. Repeat it a few times with your own words. Let the language... Repeat it a few times with your own words. Let the language become part of how you think and dream. Alright? Next up, in lesson 7, we are going to learn how to tell stories. You will learn how to share past experiences, build mini-narratives,


Repeat it a few times with your own words. Let the language... Repeat it a few times with your own words. Let the language become part of how you think and dream. Alright? Next up, in lesson 7, we are going to learn how to tell stories. You will learn how to share past experiences, build mini-narratives, You will learn how to share past experiences, build mini-narratives and keep the listeners interested. It's one of the most powerful ways to connect with others. And I can't wait to dive into it with you.


Repeat it a few times with your own words. Let the language become part of how you think and dream. Alright? Next up, in lesson 7, we are going to learn how to tell stories. You will learn how to share past experiences, build mini-narratives, You will learn how to share past experiences, build mini-narratives and keep the listeners interested. It's one of the most powerful ways to connect with others. And I can't wait to dive into it with you. And until then, keep going, keep dreaming. And until then, keep going, keep dreaming and keep speaking. Hey there, ready to jump into something fun today?


You will learn how to share past experiences, build mini-narratives and keep the listeners interested. It's one of the most powerful ways to connect with others. And I can't wait to dive into it with you. And until then, keep going, keep dreaming. And until then, keep going, keep dreaming and keep speaking. Hey there, ready to jump into something fun today? We are starting one of the most interesting and useful topics in Maths, Probability.


And until then, keep going, keep dreaming. And until then, keep going, keep dreaming and keep speaking. Hey there, ready to jump into something fun today? We are starting one of the most interesting and useful topics in Maths, Probability. Why is it useful? Because probability is everywhere. From predicting the weather to deciding who bats first in cricket or even figuring out your chances of winning a lucky draw.


We are starting one of the most interesting and useful topics in Maths, Probability. Why is it useful? Because probability is everywhere. From predicting the weather to deciding who bats first in cricket or even figuring out your chances of winning a lucky draw. So in today's lesson, we will cover what is probability, how to calculate it using a simple formula, some real life examples and a few questions to test your brain and build confidence.


Why is it useful? Because probability is everywhere. From predicting the weather to deciding who bats first in cricket or even figuring out your chances of winning a lucky draw. So in today's lesson, we will cover what is probability, how to calculate it using a simple formula, some real life examples and a few questions to test your brain and build confidence. So, let's begin. First, what is probability?


So in today's lesson, we will cover what is probability, how to calculate it using a simple formula, some real life examples and a few questions to test your brain and build confidence. So, let's begin. First, what is probability? So imagine tossing a coin. What can happen? You either get a head or a tail. Right? That's two possible outcomes. Now here's the big idea.


So, let's begin. First, what is probability? So imagine tossing a coin. What can happen? You either get a head or a tail. Right? That's two possible outcomes. Now here's the big idea. Probability is the chance that something will happen. It's like asking, out of all the possible things that can happen, what are the chances of this one thing happening? Get it?


So imagine tossing a coin. What can happen? You either get a head or a tail. Right? That's two possible outcomes. Now here's the big idea. Probability is the chance that something will happen. It's like asking, out of all the possible things that can happen, what are the chances of this one thing happening? Get it? Let's say we toss a coin. There are two possible outcomes. Head or tail. Each is equally likely.


Probability is the chance that something will happen. It's like asking, out of all the possible things that can happen, what are the chances of this one thing happening? Get it? Let's say we toss a coin. There are two possible outcomes. Head or tail. Each is equally likely. So the probability of getting a head is 1 out of 2. Or in math terms, probability of head is 1 by 2. And same for tail. Probability for tail is 1 by 2.


Let's say we toss a coin. There are two possible outcomes. Head or tail. Each is equally likely. So the probability of getting a head is 1 out of 2. Or in math terms, probability of head is 1 by 2. And same for tail. Probability for tail is 1 by 2. Simple, right? Okay, now let's move to the formula. Now here's the formula that we will use again and again.


So the probability of getting a head is 1 out of 2. Or in math terms, probability of head is 1 by 2. And same for tail. Probability for tail is 1 by 2. Simple, right? Okay, now let's move to the formula. Now here's the formula that we will use again and again. Probability of an event is equal to number of favourable outcomes divided by number of outcomes. Understand? Okay, let's break that down.


Simple, right? Okay, now let's move to the formula. Now here's the formula that we will use again and again. Probability of an event is equal to number of favourable outcomes divided by number of outcomes. Understand? Okay, let's break that down. Favourable outcomes is what you are hoping will happen. Total outcomes is all the possible things that could happen.


Probability of an event is equal to number of favourable outcomes divided by number of outcomes. Understand? Okay, let's break that down. Favourable outcomes is what you are hoping will happen. Total outcomes is all the possible things that could happen. Now say the formula out loud with me. Now, come on, say the formula out loud with me. Probability equals favorable outcomes divided by total outcomes.


Favourable outcomes is what you are hoping will happen. Total outcomes is all the possible things that could happen. Now say the formula out loud with me. Now, come on, say the formula out loud with me. Probability equals favorable outcomes divided by total outcomes. Again, your turn. Nice! Now let's try it with a simple example. Okay?


Now say the formula out loud with me. Now, come on, say the formula out loud with me. Probability equals favorable outcomes divided by total outcomes. Again, your turn. Nice! Now let's try it with a simple example. Okay? Imagine you roll a fair six-sided dice. What are the total possible outcomes? Think for a second.


Again, your turn. Nice! Now let's try it with a simple example. Okay? Imagine you roll a fair six-sided dice. What are the total possible outcomes? Think for a second. Yes, you could get 1, 2, 3, 4, 5 or 6. That is 6 outcomes.


Imagine you roll a fair six-sided dice. What are the total possible outcomes? Think for a second. Yes, you could get 1, 2, 3, 4, 5 or 6. That is 6 outcomes. Now let's say you want to know what is the probability of getting a 4.


Yes, you could get 1, 2, 3, 4, 5 or 6. That is 6 outcomes. Now let's say you want to know what is the probability of getting a 4. There is only one 4 on the dice, right? So, favourable outcomes is 1. And total outcomes is 6. So, probability will be, yes, 1 by 6.


Now let's say you want to know what is the probability of getting a 4. There is only one 4 on the dice, right? So, favourable outcomes is 1. And total outcomes is 6. So, probability will be, yes, 1 by 6. 1 divided by 6. Now it's your turn. What is the probability of getting a 5?


There is only one 4 on the dice, right? So, favourable outcomes is 1. And total outcomes is 6. So, probability will be, yes, 1 by 6. 1 divided by 6. Now it's your turn. What is the probability of getting a 5? Right again. Also, 1 out of 6 or 1 by 6. Now, let's make it a little more interesting. Okay? What's the probability of getting an even number?


1 divided by 6. Now it's your turn. What is the probability of getting a 5? Right again. Also, 1 out of 6 or 1 by 6. Now, let's make it a little more interesting. Okay? What's the probability of getting an even number? Think, what numbers are even on a dice?


Right again. Also, 1 out of 6 or 1 by 6. Now, let's make it a little more interesting. Okay? What's the probability of getting an even number? Think, what numbers are even on a dice? Yes, 2, 4 and 6. So that is 3 favourable outcomes. So total outcomes is still 6. So probability will be...


Think, what numbers are even on a dice? Yes, 2, 4 and 6. So that is 3 favourable outcomes. So total outcomes is still 6. So probability will be... Exactly. Probability is 3 by 6, 3 divided by 6, which is equal to 1 by 2. Boom! You are doing great.


Yes, 2, 4 and 6. So that is 3 favourable outcomes. So total outcomes is still 6. So probability will be... Exactly. Probability is 3 by 6, 3 divided by 6, which is equal to 1 by 2. Boom! You are doing great. Okay, now let's do a few quick ones. Answer out loud when you hear the question. Are you ready? Alright, now the first question.


Exactly. Probability is 3 by 6, 3 divided by 6, which is equal to 1 by 2. Boom! You are doing great. Okay, now let's do a few quick ones. Answer out loud when you hear the question. Are you ready? Alright, now the first question. What's the probability of getting a number greater than 4 when rolling a dice? Come on, let's think.


Okay, now let's do a few quick ones. Answer out loud when you hear the question. Are you ready? Alright, now the first question. What's the probability of getting a number greater than 4 when rolling a dice? Come on, let's think. Numbers greater than 4 are 5 and 6. That is, 2 outcomes. So the answer will be 2 divided by 6, which is 1 by 3. Alright.


What's the probability of getting a number greater than 4 when rolling a dice? Come on, let's think. Numbers greater than 4 are 5 and 6. That is, 2 outcomes. So the answer will be 2 divided by 6, which is 1 by 3. Alright. Next question, what's the probability of getting a 1 or a 2?


Numbers greater than 4 are 5 and 6. That is, 2 outcomes. So the answer will be 2 divided by 6, which is 1 by 3. Alright. Next question, what's the probability of getting a 1 or a 2? Favorable outcomes are how many? 1 and 2. So, 2 favorable outcomes and total outcomes are still 6. So, it's 2 divided by 6 which is 1 by 3 again.


Next question, what's the probability of getting a 1 or a 2? Favorable outcomes are how many? 1 and 2. So, 2 favorable outcomes and total outcomes are still 6. So, it's 2 divided by 6 which is 1 by 3 again. Third question, what's the probability of getting a number less than 7? Hmm, come on, think. What numbers are less than 7 on a dice?


Favorable outcomes are how many? 1 and 2. So, 2 favorable outcomes and total outcomes are still 6. So, it's 2 divided by 6 which is 1 by 3 again. Third question, what's the probability of getting a number less than 7? Hmm, come on, think. What numbers are less than 7 on a dice? All of them, 1 to 6 are all less than 7. So the favorable outcomes are 6 and the total outcomes 6. So probability is 6 by 6 which is 1.


Third question, what's the probability of getting a number less than 7? Hmm, come on, think. What numbers are less than 7 on a dice? All of them, 1 to 6 are all less than 7. So the favorable outcomes are 6 and the total outcomes 6. So probability is 6 by 6 which is 1. That means the event is certain to happen.


All of them, 1 to 6 are all less than 7. So the favorable outcomes are 6 and the total outcomes 6. So probability is 6 by 6 which is 1. That means the event is certain to happen. In math, when something is guaranteed, we say probability is 1. And if something is impossible, like getting an 8 on a 6-sided dice, we say the probability is 0.


That means the event is certain to happen. In math, when something is guaranteed, we say probability is 1. And if something is impossible, like getting an 8 on a 6-sided dice, we say the probability is 0. Alright quick quiz, what's the probability of getting a 9 on a dice?


In math, when something is guaranteed, we say probability is 1. And if something is impossible, like getting an 8 on a 6-sided dice, we say the probability is 0. Alright quick quiz, what's the probability of getting a 9 on a dice? Come on, think. Yes, zero. It's not even on the dice. Now let's connect this to the real world.


Alright quick quiz, what's the probability of getting a 9 on a dice? Come on, think. Yes, zero. It's not even on the dice. Now let's connect this to the real world. You have a bag with 5 red balls and 3 blue balls. Alright? So, what are the total number of balls? 8. Now, what's the probability of picking a red ball?


Come on, think. Yes, zero. It's not even on the dice. Now let's connect this to the real world. You have a bag with 5 red balls and 3 blue balls. Alright? So, what are the total number of balls? 8. Now, what's the probability of picking a red ball? Favorable is 5 balls. Total 8. So probability is 5 divided by 8.


You have a bag with 5 red balls and 3 blue balls. Alright? So, what are the total number of balls? 8. Now, what's the probability of picking a red ball? Favorable is 5 balls. Total 8. So probability is 5 divided by 8. So probability is 5 divided by 8. Now how about picking a blue one? Right, 3 divided by 8. Wow, you're finally getting a hang of this.


Favorable is 5 balls. Total 8. So probability is 5 divided by 8. So probability is 5 divided by 8. Now how about picking a blue one? Right, 3 divided by 8. Wow, you're finally getting a hang of this. So let's end this with one last challenge. A box has 10 cards numbered 1, 2, 10. Alright? So what is the probability of drawing an even number?


So probability is 5 divided by 8. Now how about picking a blue one? Right, 3 divided by 8. Wow, you're finally getting a hang of this. So let's end this with one last challenge. A box has 10 cards numbered 1, 2, 10. Alright? So what is the probability of drawing an even number? So what are the even numbers? 2, 4, 6, 8, 10. 5 of them. And what are the total numbers? 10. So probability will be...


So let's end this with one last challenge. A box has 10 cards numbered 1, 2, 10. Alright? So what is the probability of drawing an even number? So what are the even numbers? 2, 4, 6, 8, 10. 5 of them. And what are the total numbers? 10. So probability will be... 5 divided by 10, which is 1 by 2. Alright, what is the probability of drawing a number greater than 7?


So what are the even numbers? 2, 4, 6, 8, 10. 5 of them. And what are the total numbers? 10. So probability will be... 5 divided by 10, which is 1 by 2. Alright, what is the probability of drawing a number greater than 7? That is 8, 9, 10. Three numbers. So probability is 3 by 10. Crushed it. You're getting it. You're doing great.


5 divided by 10, which is 1 by 2. Alright, what is the probability of drawing a number greater than 7? That is 8, 9, 10. Three numbers. So probability is 3 by 10. Crushed it. You're getting it. You're doing great. So this week, here's your mission.


That is 8, 9, 10. Three numbers. So probability is 3 by 10. Crushed it. You're getting it. You're doing great. So this week, here's your mission. Look around your home or classroom and find three real-life situations where probability is involved. It could be tossing a coin, drawing a card, guessing the color of a marble from a bag, anything. Alright? Then write or say the probability for each event. Using the formula, favorable outcomes divided by total outcomes.


So this week, here's your mission. Look around your home or classroom and find three real-life situations where probability is involved. It could be tossing a coin, drawing a card, guessing the color of a marble from a bag, anything. Alright? Then write or say the probability for each event. Using the formula, favorable outcomes divided by total outcomes. So next time, we will go deeper into complementary elements and how to calculate the probability of things not happening. Okay? But for now, you just keep...


Look around your home or classroom and find three real-life situations where probability is involved. It could be tossing a coin, drawing a card, guessing the color of a marble from a bag, anything. Alright? Then write or say the probability for each event. Using the formula, favorable outcomes divided by total outcomes. So next time, we will go deeper into complementary elements and how to calculate the probability of things not happening. Okay? But for now, you just keep... You just took a huge step in mastering probability. I'm so proud of you. Keep practicing, keep solving. And I will see you in the next lesson.


So next time, we will go deeper into complementary elements and how to calculate the probability of things not happening. Okay? But for now, you just keep... You just took a huge step in mastering probability. I'm so proud of you. Keep practicing, keep solving. And I will see you in the next lesson. Hey again, welcome back to Probability. Now in the last lesson, you learnt what probability is, how to use the basic formula and how to solve some everyday problems using coins, dice and balls. Today, we are going one step further and learning a really important concept.


You just took a huge step in mastering probability. I'm so proud of you. Keep practicing, keep solving. And I will see you in the next lesson. Hey again, welcome back to Probability. Now in the last lesson, you learnt what probability is, how to use the basic formula and how to solve some everyday problems using coins, dice and balls. Today, we are going one step further and learning a really important concept. Complimentary elements. Sounds fancy, right? But don't worry. I'll break it down nice and easy. So, what are complementary events?


Hey again, welcome back to Probability. Now in the last lesson, you learnt what probability is, how to use the basic formula and how to solve some everyday problems using coins, dice and balls. Today, we are going one step further and learning a really important concept. Complimentary elements. Sounds fancy, right? But don't worry. I'll break it down nice and easy. So, what are complementary events? Let's say you toss a coin. What are the possible outcomes? You already know. Head or tail.


Complimentary elements. Sounds fancy, right? But don't worry. I'll break it down nice and easy. So, what are complementary events? Let's say you toss a coin. What are the possible outcomes? You already know. Head or tail. So, if the probability of getting a head is 1 by 2, then what is the probability of not getting a head? Yes, that is also 1 by 2. Because that would mean you got a tail.


Let's say you toss a coin. What are the possible outcomes? You already know. Head or tail. So, if the probability of getting a head is 1 by 2, then what is the probability of not getting a head? Yes, that is also 1 by 2. Because that would mean you got a tail. This is called a complementary event. So basically, if there are only...


So, if the probability of getting a head is 1 by 2, then what is the probability of not getting a head? Yes, that is also 1 by 2. Because that would mean you got a tail. This is called a complementary event. So basically, if there are only... So basically, if there are only two probable...


This is called a complementary event. So basically, if there are only... So basically, if there are only two probable... So basically, if there are only two possibilities and one does not happen, the other one must happen. So here's the key idea.


So basically, if there are only two probable... So basically, if there are only two possibilities and one does not happen, the other one must happen. So here's the key idea. Probability of an event plus probability of the event not happening is equal to 1. Are you understanding? Let's say event A is equal to getting a head.


So basically, if there are only two possibilities and one does not happen, the other one must happen. So here's the key idea. Probability of an event plus probability of the event not happening is equal to 1. Are you understanding? Let's say event A is equal to getting a head. then not A is equal to getting a tail. So, PA plus P not A is equal to 1. Come on, say it with me.


Probability of an event plus probability of the event not happening is equal to 1. Are you understanding? Let's say event A is equal to getting a head. then not A is equal to getting a tail. So, PA plus P not A is equal to 1. Come on, say it with me. Probability of something happening plus not happening equals 1. Now your turn.


then not A is equal to getting a tail. So, PA plus P not A is equal to 1. Come on, say it with me. Probability of something happening plus not happening equals 1. Now your turn. Now that is called a complete outcome when you cover all possibilities. Let's try this with a simple example.


Probability of something happening plus not happening equals 1. Now your turn. Now that is called a complete outcome when you cover all possibilities. Let's try this with a simple example. Imagine there is a bag with 3 red marbles, 2 green marbles, and 5 blue marbles. How many total marbles are there?


Now that is called a complete outcome when you cover all possibilities. Let's try this with a simple example. Imagine there is a bag with 3 red marbles, 2 green marbles, and 5 blue marbles. How many total marbles are there? 3 plus 2 plus 5 which is equal to 10. Let's say you want the probability of not


Imagine there is a bag with 3 red marbles, 2 green marbles, and 5 blue marbles. How many total marbles are there? 3 plus 2 plus 5 which is equal to 10. Let's say you want the probability of not Now let's say you want to get the probability of not getting a green marble. Let's say


3 plus 2 plus 5 which is equal to 10. Let's say you want the probability of not Now let's say you want to get the probability of not getting a green marble. Let's say So first, let's find P getting a green is equal to 2 by 10.


Now let's say you want to get the probability of not getting a green marble. Let's say So first, let's find P getting a green is equal to 2 by 10. Now apply the rule, p not green is equal to 1 minus p green. So, 1 minus 2 by 10 is equal to 8 by 10. 8 by 10 is equal to 4 by 5.


So first, let's find P getting a green is equal to 2 by 10. Now apply the rule, p not green is equal to 1 minus p green. So, 1 minus 2 by 10 is equal to 8 by 10. 8 by 10 is equal to 4 by 5. And it's done. Now it's your turn. Are you ready?


Now apply the rule, p not green is equal to 1 minus p green. So, 1 minus 2 by 10 is equal to 8 by 10. 8 by 10 is equal to 4 by 5. And it's done. Now it's your turn. Are you ready? Now it's your turn. Ready? Okay. There are 7 black pens and 3 red pens in a box. You pick one pen randomly. What's the probability?


And it's done. Now it's your turn. Are you ready? Now it's your turn. Ready? Okay. There are 7 black pens and 3 red pens in a box. You pick one pen randomly. What's the probability? And you pick one pen randomly. Now, what is the probability of not getting a red pen? Think about it. Come on. Okay. Now, let's solve this together.


Now it's your turn. Ready? Okay. There are 7 black pens and 3 red pens in a box. You pick one pen randomly. What's the probability? And you pick one pen randomly. Now, what is the probability of not getting a red pen? Think about it. Come on. Okay. Now, let's solve this together. Total pens is how much? 10. And how many red pens are there? 3. So probability of red is 3 by 10. And probability of not?


And you pick one pen randomly. Now, what is the probability of not getting a red pen? Think about it. Come on. Okay. Now, let's solve this together. Total pens is how much? 10. And how many red pens are there? 3. So probability of red is 3 by 10. And probability of not? And probability of not red is 1 minus 3 by 10, which is 7 by 10. That's it. Nailed it. Complementary events in action.


Total pens is how much? 10. And how many red pens are there? 3. So probability of red is 3 by 10. And probability of not? And probability of not red is 1 minus 3 by 10, which is 7 by 10. That's it. Nailed it. Complementary events in action. Okay, now let's do a few more real-life examples together. Alright? So, you roll a dice and what is the probability of not getting a 6? Think!


And probability of not red is 1 minus 3 by 10, which is 7 by 10. That's it. Nailed it. Complementary events in action. Okay, now let's do a few more real-life examples together. Alright? So, you roll a dice and what is the probability of not getting a 6? Think! Getting a 6 is one outcome. Total outcomes are 6. So probability for 6 is 1 by 6. And probability for no 6...


Okay, now let's do a few more real-life examples together. Alright? So, you roll a dice and what is the probability of not getting a 6? Think! Getting a 6 is one outcome. Total outcomes are 6. So probability for 6 is 1 by 6. And probability for no 6... And probability for not 6 is 1 minus 1 by 6, which is equal to 5 by 6. Exactly.


Getting a 6 is one outcome. Total outcomes are 6. So probability for 6 is 1 by 6. And probability for no 6... And probability for not 6 is 1 minus 1 by 6, which is equal to 5 by 6. Exactly. Now you try this one. A card is drawn from a deck of 52 cards. What is the probability that it is not a heart?


And probability for not 6 is 1 minus 1 by 6, which is equal to 5 by 6. Exactly. Now you try this one. A card is drawn from a deck of 52 cards. What is the probability that it is not a heart? Let's solve this. Alright. There are 13 hearts in a deck. So, probability for a heart card is 13 by 52.


Now you try this one. A card is drawn from a deck of 52 cards. What is the probability that it is not a heart? Let's solve this. Alright. There are 13 hearts in a deck. So, probability for a heart card is 13 by 52. Probability for not hard is 1 minus 13 by 52 which is equal to 39 by 52.


Let's solve this. Alright. There are 13 hearts in a deck. So, probability for a heart card is 13 by 52. Probability for not hard is 1 minus 13 by 52 which is equal to 39 by 52. And let's simplify that. Yes, 3 by 4. So the final answer is 3 by 4. You are getting faster and sharper.


Probability for not hard is 1 minus 13 by 52 which is equal to 39 by 52. And let's simplify that. Yes, 3 by 4. So the final answer is 3 by 4. You are getting faster and sharper. Okay, let's do a rapid fire round and answer out loud as fast as you can. Are you ready?


And let's simplify that. Yes, 3 by 4. So the final answer is 3 by 4. You are getting faster and sharper. Okay, let's do a rapid fire round and answer out loud as fast as you can. Are you ready? Okay, so the first question is, there are 8 marbles in a bag. 3 are yellow and... There are 8 marbles in a bag. 3 are yellow. What is the probability of not picking yellow?


Okay, let's do a rapid fire round and answer out loud as fast as you can. Are you ready? Okay, so the first question is, there are 8 marbles in a bag. 3 are yellow and... There are 8 marbles in a bag. 3 are yellow. What is the probability of not picking yellow? Yes, 5 by 8. Alright, second question. A coin is tossed. What is the probability of not getting tails?


Okay, so the first question is, there are 8 marbles in a bag. 3 are yellow and... There are 8 marbles in a bag. 3 are yellow. What is the probability of not picking yellow? Yes, 5 by 8. Alright, second question. A coin is tossed. What is the probability of not getting tails? 1 by 2, yes. The last one.


Yes, 5 by 8. Alright, second question. A coin is tossed. What is the probability of not getting tails? 1 by 2, yes. The last one. the last one. A number between 1 and 10 is chosen. What is the probability that it is


1 by 2, yes. The last one. the last one. A number between 1 and 10 is chosen. What is the probability that it is A number between 1 and 10 is chosen. What is the probability that it is not 7?


the last one. A number between 1 and 10 is chosen. What is the probability that it is A number between 1 and 10 is chosen. What is the probability that it is not 7? Exactly. There are 9 other numbers. So, 9 by 10. That's it.


A number between 1 and 10 is chosen. What is the probability that it is not 7? Exactly. There are 9 other numbers. So, 9 by 10. That's it. Now see, complementary events are everywhere. Think about it. If the chances of raining tomorrow is 30%, then the chance of not raining is...


Exactly. There are 9 other numbers. So, 9 by 10. That's it. Now see, complementary events are everywhere. Think about it. If the chances of raining tomorrow is 30%, then the chance of not raining is... 70%. This is how weather reports work, how games calculate odds, or even how companies predict customer behavior. So when you understand this idea, you are not just doing math, you are learning how to read the world around you. Okay?


Now see, complementary events are everywhere. Think about it. If the chances of raining tomorrow is 30%, then the chance of not raining is... 70%. This is how weather reports work, how games calculate odds, or even how companies predict customer behavior. So when you understand this idea, you are not just doing math, you are learning how to read the world around you. Okay? So let's go over what we learned today. Complementary events are opposite outcomes. Like rain or no rain, win or lose.


70%. This is how weather reports work, how games calculate odds, or even how companies predict customer behavior. So when you understand this idea, you are not just doing math, you are learning how to read the world around you. Okay? So let's go over what we learned today. Complementary events are opposite outcomes. Like rain or no rain, win or lose. P event plus P not event is always equal to 1. You can always subtract the event's probability from 1 to find its complement.


So let's go over what we learned today. Complementary events are opposite outcomes. Like rain or no rain, win or lose. P event plus P not event is always equal to 1. You can always subtract the event's probability from 1 to find its complement. Real life examples are all around you. So use them. So here's your mission for next week.


P event plus P not event is always equal to 1. You can always subtract the event's probability from 1 to find its complement. Real life examples are all around you. So use them. So here's your mission for next week. Find three situations in daily life where there are only two outcomes and calculate the probability of each one plus its complement.


Real life examples are all around you. So use them. So here's your mission for next week. Find three situations in daily life where there are only two outcomes and calculate the probability of each one plus its complement. Alright, so you could use tossing a coin, passing or failing a test or guessing whether a number is odd or even and say both. The probability of this happening is...


Find three situations in daily life where there are only two outcomes and calculate the probability of each one plus its complement. Alright, so you could use tossing a coin, passing or failing a test or guessing whether a number is odd or even and say both. The probability of this happening is... And you have to say both. The probability of this happening is this much. So the probability of it not happening is this much.


Alright, so you could use tossing a coin, passing or failing a test or guessing whether a number is odd or even and say both. The probability of this happening is... And you have to say both. The probability of this happening is this much. So the probability of it not happening is this much. Wow! You are now thinking like a math wizard. So in the next lesson, we will take on some word problems and questions from the past exams. So you will be ready not just to understand but to score high.


And you have to say both. The probability of this happening is this much. So the probability of it not happening is this much. Wow! You are now thinking like a math wizard. So in the next lesson, we will take on some word problems and questions from the past exams. So you will be ready not just to understand but to score high. Until then, keep solving.


Wow! You are now thinking like a math wizard. So in the next lesson, we will take on some word problems and questions from the past exams. So you will be ready not just to understand but to score high. Until then, keep solving. Until then, keep solving, keep questioning. And remember, math is not about memorizing. It's about seeing patterns. So see you in the next one.


Until then, keep solving. Until then, keep solving, keep questioning. And remember, math is not about memorizing. It's about seeing patterns. So see you in the next one. Okay, perfect. Let's get into lesson 3.


Until then, keep solving, keep questioning. And remember, math is not about memorizing. It's about seeing patterns. So see you in the next one. Okay, perfect. Let's get into lesson 3. Okay, perfect. Let's get into lesson 3. Now this lesson helps the learner apply what they've learnt in real exam-like scenarios while keeping things friendly, supportive and interactive.


Okay, perfect. Let's get into lesson 3. Okay, perfect. Let's get into lesson 3. Now this lesson helps the learner apply what they've learnt in real exam-like scenarios while keeping things friendly, supportive and interactive. Welcome back. You've already mastered the basics of probability and complementary events. Great work. Now, it's time to level up.


Okay, perfect. Let's get into lesson 3. Now this lesson helps the learner apply what they've learnt in real exam-like scenarios while keeping things friendly, supportive and interactive. Welcome back. You've already mastered the basics of probability and complementary events. Great work. Now, it's time to level up. Now it's time to level up and learn how to handle word problems. Just like the ones that you will see in your CBSC exam.


Welcome back. You've already mastered the basics of probability and complementary events. Great work. Now, it's time to level up. Now it's time to level up and learn how to handle word problems. Just like the ones that you will see in your CBSC exam. Now these questions test not just your math skills but your ability to understand the situation, organize the information and apply the formula. And guess what? You can do this.


Now it's time to level up and learn how to handle word problems. Just like the ones that you will see in your CBSC exam. Now these questions test not just your math skills but your ability to understand the situation, organize the information and apply the formula. And guess what? You can do this. Okay, so here's the truth. Word problems are just stories with numbers. And in every story, we look for, we look for what we know, what we are asked and what we need to solve.


Now these questions test not just your math skills but your ability to understand the situation, organize the information and apply the formula. And guess what? You can do this. Okay, so here's the truth. Word problems are just stories with numbers. And in every story, we look for, we look for what we know, what we are asked and what we need to solve. So at any time you see a probability word problem,


Okay, so here's the truth. Word problems are just stories with numbers. And in every story, we look for, we look for what we know, what we are asked and what we need to solve. So at any time you see a probability word problem, So anytime that you see a probability word problem, ask yourself, what are the total outcomes, what are the favorable outcomes, and then apply the golden rule.


So at any time you see a probability word problem, So anytime that you see a probability word problem, ask yourself, what are the total outcomes, what are the favorable outcomes, and then apply the golden rule. Probability event is equal to favourable divided by total. So let's start with an easy one.


So anytime that you see a probability word problem, ask yourself, what are the total outcomes, what are the favorable outcomes, and then apply the golden rule. Probability event is equal to favourable divided by total. So let's start with an easy one. A bag contains 3 red, 5 blue and 2 green marbles. One marble is picked at random. What is the probability that it is red?


Probability event is equal to favourable divided by total. So let's start with an easy one. A bag contains 3 red, 5 blue and 2 green marbles. One marble is picked at random. What is the probability that it is red? What is the probability that it is A, red, B, not blue? So let's solve this step by step.


A bag contains 3 red, 5 blue and 2 green marbles. One marble is picked at random. What is the probability that it is red? What is the probability that it is A, red, B, not blue? So let's solve this step by step. Total outcomes is red 3, blue 5, green 2. So the total will...


What is the probability that it is A, red, B, not blue? So let's solve this step by step. Total outcomes is red 3, blue 5, green 2. So the total will... So the total is 3 plus 5 plus 2 which is 10.


Total outcomes is red 3, blue 5, green 2. So the total will... So the total is 3 plus 5 plus 2 which is 10. So probability of red is equal to favourable divided by total which is 3 divided by 10. Probability of not blue is


So the total is 3 plus 5 plus 2 which is 10. So probability of red is equal to favourable divided by total which is 3 divided by 10. Probability of not blue is Now see, first, how many marbles are not blue? Red plus green, which is 3 plus 2, that is 5. So, the probability...


So probability of red is equal to favourable divided by total which is 3 divided by 10. Probability of not blue is Now see, first, how many marbles are not blue? Red plus green, which is 3 plus 2, that is 5. So, the probability... So, the probability of not blue will be 5 divided by 10, which is 1 by 2. Okay, so now it is your turn.


Now see, first, how many marbles are not blue? Red plus green, which is 3 plus 2, that is 5. So, the probability... So, the probability of not blue will be 5 divided by 10, which is 1 by 2. Okay, so now it is your turn. A bag has 4 yellow, 3 white and 3 pink marbles. What is the probability of picking A. A white marble and B. Not yellow.


So, the probability of not blue will be 5 divided by 10, which is 1 by 2. Okay, so now it is your turn. A bag has 4 yellow, 3 white and 3 pink marbles. What is the probability of picking A. A white marble and B. Not yellow. Come on, take a minute. Say it out loud and then solve it. Alright, let's check. So the total is 4 plus 3 plus 3, which is 10 marbles.


A bag has 4 yellow, 3 white and 3 pink marbles. What is the probability of picking A. A white marble and B. Not yellow. Come on, take a minute. Say it out loud and then solve it. Alright, let's check. So the total is 4 plus 3 plus 3, which is 10 marbles. White marble's probability will be 3 by 10.


Come on, take a minute. Say it out loud and then solve it. Alright, let's check. So the total is 4 plus 3 plus 3, which is 10 marbles. White marble's probability will be 3 by 10. Now, not yellow marbles will be 3 plus 3, which is 6. So, the probability is 6 by 10, which is 3 by 5. That's it. Doing great!


White marble's probability will be 3 by 10. Now, not yellow marbles will be 3 plus 3, which is 6. So, the probability is 6 by 10, which is 3 by 5. That's it. Doing great! Alright, the next question. A card is drawn from a well-shuffled deck of 52 playing cards. Find the probability of getting a king, a red card and not a queen.


Now, not yellow marbles will be 3 plus 3, which is 6. So, the probability is 6 by 10, which is 3 by 5. That's it. Doing great! Alright, the next question. A card is drawn from a well-shuffled deck of 52 playing cards. Find the probability of getting a king, a red card and not a queen. Alright, let's decode this. The first one. What are the total number of cards? 52. Now, how many kings are there?


Alright, the next question. A card is drawn from a well-shuffled deck of 52 playing cards. Find the probability of getting a king, a red card and not a queen. Alright, let's decode this. The first one. What are the total number of cards? 52. Now, how many kings are there? There are four kings. King of hearts, diamonds, clubs and spades. So, the probability of drawing a king are


Alright, let's decode this. The first one. What are the total number of cards? 52. Now, how many kings are there? There are four kings. King of hearts, diamonds, clubs and spades. So, the probability of drawing a king are So the probability of drawing a king is 4 by 52 which is 1 by 13.


There are four kings. King of hearts, diamonds, clubs and spades. So, the probability of drawing a king are So the probability of drawing a king is 4 by 52 which is 1 by 13. The second, the red cards is equal to all the heart cards and all the diamond cards which is a total of 26.


So the probability of drawing a king is 4 by 52 which is 1 by 13. The second, the red cards is equal to all the heart cards and all the diamond cards which is a total of 26. So the probability of drawing a red card is 26 by 52 which is 1 by 2.


The second, the red cards is equal to all the heart cards and all the diamond cards which is a total of 26. So the probability of drawing a red card is 26 by 52 which is 1 by 2. Alright, now how many queens are there? There are a total of 4 queens.


So the probability of drawing a red card is 26 by 52 which is 1 by 2. Alright, now how many queens are there? There are a total of 4 queens. So, not queen will be 52 minus 4, which is 48. So, what is the probability of...


Alright, now how many queens are there? There are a total of 4 queens. So, not queen will be 52 minus 4, which is 48. So, what is the probability of... So what is the probability of drawing a card which is not a queen? It will be 48 divided by 52, which is 12 by 13. Alright, so now it's your turn.


So, not queen will be 52 minus 4, which is 48. So, what is the probability of... So what is the probability of drawing a card which is not a queen? It will be 48 divided by 52, which is 12 by 13. Alright, so now it's your turn. A card is drawn from a pack of 52 cards. What is the probability of getting a black card and not an ace? Come on, try it.


So what is the probability of drawing a card which is not a queen? It will be 48 divided by 52, which is 12 by 13. Alright, so now it's your turn. A card is drawn from a pack of 52 cards. What is the probability of getting a black card and not an ace? Come on, try it. So the answers are as follows. The track is...


A card is drawn from a pack of 52 cards. What is the probability of getting a black card and not an ace? Come on, try it. So the answers are as follows. The track is... The total of black cards is spades plus clubs, which is 26. So the probability will be 26 divided by 52, which is 1 by 2.


So the answers are as follows. The track is... The total of black cards is spades plus clubs, which is 26. So the probability will be 26 divided by 52, which is 1 by 2. And the probability of not an ace will be


The total of black cards is spades plus clubs, which is 26. So the probability will be 26 divided by 52, which is 1 by 2. And the probability of not an ace will be So the total number of aces are how many? 4. So not an ace will be 52 minus 4. That is 48. So the probability will be 48 divided by 52.


And the probability of not an ace will be So the total number of aces are how many? 4. So not an ace will be 52 minus 4. That is 48. So the probability will be 48 divided by 52. See, just break it down and apply what you know. It's as simple as that. Okay, let's pause here and go over three mistakes that students make often.


So the total number of aces are how many? 4. So not an ace will be 52 minus 4. That is 48. So the probability will be 48 divided by 52. See, just break it down and apply what you know. It's as simple as that. Okay, let's pause here and go over three mistakes that students make often. Now, the first one is not counting total outcomes correctly. Always double check your total. It is a full deck. All marbles. Is anything missing?


See, just break it down and apply what you know. It's as simple as that. Okay, let's pause here and go over three mistakes that students make often. Now, the first one is not counting total outcomes correctly. Always double check your total. It is a full deck. All marbles. Is anything missing? The second one, forgetting to simplify the final answer. If your answer is 10 by 2, you need to simplify it. That is, you have to... That is, 10 by...


Now, the first one is not counting total outcomes correctly. Always double check your total. It is a full deck. All marbles. Is anything missing? The second one, forgetting to simplify the final answer. If your answer is 10 by 2, you need to simplify it. That is, you have to... That is, 10 by... That is, 10 by 20 becomes 1 by 2. CBSC loves clean answers. Alright? And third, misreading not or at least or more than.


The second one, forgetting to simplify the final answer. If your answer is 10 by 2, you need to simplify it. That is, you have to... That is, 10 by... That is, 10 by 20 becomes 1 by 2. CBSC loves clean answers. Alright? And third, misreading not or at least or more than. Always pay attention to phrasing. If the question says, not a king, that's asking for the compliment. Alright, let's practice a tricky question.


That is, 10 by 20 becomes 1 by 2. CBSC loves clean answers. Alright? And third, misreading not or at least or more than. Always pay attention to phrasing. If the question says, not a king, that's asking for the compliment. Alright, let's practice a tricky question. A number is chosen at random from the numbers 1 to 20. What is the probability that the number chosen is a multiple of 3 and not a multiple of 5?


Always pay attention to phrasing. If the question says, not a king, that's asking for the compliment. Alright, let's practice a tricky question. A number is chosen at random from the numbers 1 to 20. What is the probability that the number chosen is a multiple of 3 and not a multiple of 5? All right, first, let...


A number is chosen at random from the numbers 1 to 20. What is the probability that the number chosen is a multiple of 3 and not a multiple of 5? All right, first, let... Okay, let's begin. First, let's list down the numbers between 1 and 20. Now, find out how many of these numbers are multiples of 3. Let's see.


All right, first, let... Okay, let's begin. First, let's list down the numbers between 1 and 20. Now, find out how many of these numbers are multiples of 3. Let's see. 3, 6, 9, 12, 15 and 18. So, a total of 6 numbers.


Okay, let's begin. First, let's list down the numbers between 1 and 20. Now, find out how many of these numbers are multiples of 3. Let's see. 3, 6, 9, 12, 15 and 18. So, a total of 6 numbers. Now the total numbers are 20, so the probability of drawing a card with a multiple of 3 is 6.


3, 6, 9, 12, 15 and 18. So, a total of 6 numbers. Now the total numbers are 20, so the probability of drawing a card with a multiple of 3 is 6. Alright, so the probability of getting a number which is a multiple of 3 is 6 by 20 which is simplified to 3 by 10.


Now the total numbers are 20, so the probability of drawing a card with a multiple of 3 is 6. Alright, so the probability of getting a number which is a multiple of 3 is 6 by 20 which is simplified to 3 by 10. Now, for the second part of the question.


Alright, so the probability of getting a number which is a multiple of 3 is 6 by 20 which is simplified to 3 by 10. Now, for the second part of the question. Now, multiples of 5 in that range, that is, 1 to 20 are 5, 10, 15 and 20. 4 numbers. So, not a multiple of 5 will be 20 minus 4. That is, 16 numbers will not be a multiple of 15.


Now, for the second part of the question. Now, multiples of 5 in that range, that is, 1 to 20 are 5, 10, 15 and 20. 4 numbers. So, not a multiple of 5 will be 20 minus 4. That is, 16 numbers will not be a multiple of 15. So, the probability of getting a number which is not a multiple of 15


Now, multiples of 5 in that range, that is, 1 to 20 are 5, 10, 15 and 20. 4 numbers. So, not a multiple of 5 will be 20 minus 4. That is, 16 numbers will not be a multiple of 15. So, the probability of getting a number which is not a multiple of 15 So, the probability of getting a number which is not a multiple of 5 is 16 by 20 which is simplified to 4 by 5.


So, the probability of getting a number which is not a multiple of 15 So, the probability of getting a number which is not a multiple of 5 is 16 by 20 which is simplified to 4 by 5. That's it. Well done. This is exam level now. Alright, let's try a quick practice quiz and see all your...


So, the probability of getting a number which is not a multiple of 5 is 16 by 20 which is simplified to 4 by 5. That's it. Well done. This is exam level now. Alright, let's try a quick practice quiz and see all your... Alright, let's try a quick practice quiz. You have to say your answers out loud. Are you ready? Okay. So the... Okay.


That's it. Well done. This is exam level now. Alright, let's try a quick practice quiz and see all your... Alright, let's try a quick practice quiz. You have to say your answers out loud. Are you ready? Okay. So the... Okay. So, a number from 1 to 10 is chosen. What is the probability of getting a prime number and not a prime number? Think.


Alright, let's try a quick practice quiz. You have to say your answers out loud. Are you ready? Okay. So the... Okay. So, a number from 1 to 10 is chosen. What is the probability of getting a prime number and not a prime number? Think. First, you need to know what are the prime numbers between 1 to 10. They are 2, 3, 5 and 7. A total of 4 prime numbers between 1 to 10. So, the probability of getting a prime number will be 4 to 10.


So, a number from 1 to 10 is chosen. What is the probability of getting a prime number and not a prime number? Think. First, you need to know what are the prime numbers between 1 to 10. They are 2, 3, 5 and 7. A total of 4 prime numbers between 1 to 10. So, the probability of getting a prime number will be 4 to 10. 4 by 10 which is simplified to 2 by 5 and what is the probability and what will be the


First, you need to know what are the prime numbers between 1 to 10. They are 2, 3, 5 and 7. A total of 4 prime numbers between 1 to 10. So, the probability of getting a prime number will be 4 to 10. 4 by 10 which is simplified to 2 by 5 and what is the probability and what will be the And what will be the probability of not getting a prime number? That will be 6 by 10, which is simplified to 3 by 5.


4 by 10 which is simplified to 2 by 5 and what is the probability and what will be the And what will be the probability of not getting a prime number? That will be 6 by 10, which is simplified to 3 by 5. Okay, next question. A bag contains 6 black balls and 4 white balls. Find the probability of picking a white ball and not a black ball.


And what will be the probability of not getting a prime number? That will be 6 by 10, which is simplified to 3 by 5. Okay, next question. A bag contains 6 black balls and 4 white balls. Find the probability of picking a white ball and not a black ball. So what are the answers? Think.


Okay, next question. A bag contains 6 black balls and 4 white balls. Find the probability of picking a white ball and not a black ball. So what are the answers? Think. Yes, the probability of getting a white ball is 4 by 10 simplified to 2 by 5. And the probability of getting not a black ball is 4 by 10 which is simplified to 2 by 5.


So what are the answers? Think. Yes, the probability of getting a white ball is 4 by 10 simplified to 2 by 5. And the probability of getting not a black ball is 4 by 10 which is simplified to 2 by 5. Alright, so I'm going to give you a mission. First, you need to solve 5 word problems for your text.


Yes, the probability of getting a white ball is 4 by 10 simplified to 2 by 5. And the probability of getting not a black ball is 4 by 10 which is simplified to 2 by 5. Alright, so I'm going to give you a mission. First, you need to solve 5 word problems for your text. You need to solve five, you need to solve five word problems for


Alright, so I'm going to give you a mission. First, you need to solve 5 word problems for your text. You need to solve five, you need to solve five word problems for You need to solve 5 word problems from your textbook or previous year papers. And for each, follow this checklist. Always identify the total outcomes, find the favorable outcomes, apply the formula, simplify the answer and check if it's a complement. But that is only if it's needed.


You need to solve five, you need to solve five word problems for You need to solve 5 word problems from your textbook or previous year papers. And for each, follow this checklist. Always identify the total outcomes, find the favorable outcomes, apply the formula, simplify the answer and check if it's a complement. But that is only if it's needed. Okay, say each answer out loud after writing it. This builds both speed and confidence and prepares you for both written and oral practice. Okay, so in the next lesson, we will take on probability plus geometry crossover problems.


You need to solve 5 word problems from your textbook or previous year papers. And for each, follow this checklist. Always identify the total outcomes, find the favorable outcomes, apply the formula, simplify the answer and check if it's a complement. But that is only if it's needed. Okay, say each answer out loud after writing it. This builds both speed and confidence and prepares you for both written and oral practice. Okay, so in the next lesson, we will take on probability plus geometry crossover problems. Alright, so in the next lesson, we will take on probability plus geometry crossover problems. And we will solve the questions where probability meets shapes, colours and logic. Until then, keep practising, keep solving. And always remember, math is not hard when it makes sense.


Okay, say each answer out loud after writing it. This builds both speed and confidence and prepares you for both written and oral practice. Okay, so in the next lesson, we will take on probability plus geometry crossover problems. Alright, so in the next lesson, we will take on probability plus geometry crossover problems. And we will solve the questions where probability meets shapes, colours and logic. Until then, keep practising, keep solving. And always remember, math is not hard when it makes sense. Awesome! Now let's go for lesson 4. Now this lesson is where we tie everything together. Basic formula, complementary events and word problems. But for now, we bring in visual logic, diagrams and set-based reasoning. Stuff that often shows up in CBSE style application questions.


Alright, so in the next lesson, we will take on probability plus geometry crossover problems. And we will solve the questions where probability meets shapes, colours and logic. Until then, keep practising, keep solving. And always remember, math is not hard when it makes sense. Awesome! Now let's go for lesson 4. Now this lesson is where we tie everything together. Basic formula, complementary events and word problems. But for now, we bring in visual logic, diagrams and set-based reasoning. Stuff that often shows up in CBSE style application questions. Hey, welcome to Lesson 4. So far, we've built a strong foundation in probability. We understand what it means, how to calculate it, and how to handle word problems. Today, we are going to stretch our brain a bit more and solve multi-concept problems, the sum by


Awesome! Now let's go for lesson 4. Now this lesson is where we tie everything together. Basic formula, complementary events and word problems. But for now, we bring in visual logic, diagrams and set-based reasoning. Stuff that often shows up in CBSE style application questions. Hey, welcome to Lesson 4. So far, we've built a strong foundation in probability. We understand what it means, how to calculate it, and how to handle word problems. Today, we are going to stretch our brain a bit more and solve multi-concept problems, the sum by And solve multi-concept problems, some that involve sets, visual categories, or logic puzzles.


Hey, welcome to Lesson 4. So far, we've built a strong foundation in probability. We understand what it means, how to calculate it, and how to handle word problems. Today, we are going to stretch our brain a bit more and solve multi-concept problems, the sum by And solve multi-concept problems, some that involve sets, visual categories, or logic puzzles. So this kind of question shows up in real life and in your CBSE board exam. And with a little practice, you will be totally ready for them. So, let's jump right in.


And solve multi-concept problems, some that involve sets, visual categories, or logic puzzles. So this kind of question shows up in real life and in your CBSE board exam. And with a little practice, you will be totally ready for them. So, let's jump right in. So, sometimes a question won't list items. It will show you a table or grouped data.


So this kind of question shows up in real life and in your CBSE board exam. And with a little practice, you will be totally ready for them. So, let's jump right in. So, sometimes a question won't list items. It will show you a table or grouped data. Here's an example. A group of 30 students was surveyed about their favourite subject. Results. 12 like math, 10 like science and 8 like English.


So, sometimes a question won't list items. It will show you a table or grouped data. Here's an example. A group of 30 students was surveyed about their favourite subject. Results. 12 like math, 10 like science and 8 like English. Now, if one student is selected at random, what is the probability that they like science or they do not like English?


Here's an example. A group of 30 students was surveyed about their favourite subject. Results. 12 like math, 10 like science and 8 like English. Now, if one student is selected at random, what is the probability that they like science or they do not like English? So, how will we work through this problem? Okay, let's take this step by step. So, what are the total number of students? 30. How many of them are favorable for science?


Now, if one student is selected at random, what is the probability that they like science or they do not like English? So, how will we work through this problem? Okay, let's take this step by step. So, what are the total number of students? 30. How many of them are favorable for science? 10 students. So the probability that they like science will be 10 by 30 which is simplified to 1 by 3.


So, how will we work through this problem? Okay, let's take this step by step. So, what are the total number of students? 30. How many of them are favorable for science? 10 students. So the probability that they like science will be 10 by 30 which is simplified to 1 by 3. The second one, what is the probability that they do not like English? Now, everyone except 8 do not like English.


10 students. So the probability that they like science will be 10 by 30 which is simplified to 1 by 3. The second one, what is the probability that they do not like English? Now, everyone except 8 do not like English. So, it will be 30 minus 8, which is 22. So, the probability will be 22 by 30, which is simplified to 11 by 15.


The second one, what is the probability that they do not like English? Now, everyone except 8 do not like English. So, it will be 30 minus 8, which is 22. So, the probability will be 22 by 30, which is simplified to 11 by 15. Okay, never forget to get, okay, never forget to get the simplified form. Alright, now you try.


So, it will be 30 minus 8, which is 22. So, the probability will be 22 by 30, which is simplified to 11 by 15. Okay, never forget to get, okay, never forget to get the simplified form. Alright, now you try. A box contains 5 red pens, 7 blue pens and 3 black pens. One pen is picked at random. What is the probability of picking a black pen, not picking a red pen?


Okay, never forget to get, okay, never forget to get the simplified form. Alright, now you try. A box contains 5 red pens, 7 blue pens and 3 black pens. One pen is picked at random. What is the probability of picking a black pen, not picking a red pen? Come on, give it time, think about it, and then say your answer.


A box contains 5 red pens, 7 blue pens and 3 black pens. One pen is picked at random. What is the probability of picking a black pen, not picking a red pen? Come on, give it time, think about it, and then say your answer. Okay, now let's check. The total is 5 plus 7 plus 3, which is 15 pence in total.


Come on, give it time, think about it, and then say your answer. Okay, now let's check. The total is 5 plus 7 plus 3, which is 15 pence in total. How many black pens are there? 3. So the probability of picking a black pen is 3 by 15 which equals to 1 by 5.


Okay, now let's check. The total is 5 plus 7 plus 3, which is 15 pence in total. How many black pens are there? 3. So the probability of picking a black pen is 3 by 15 which equals to 1 by 5. And what is the probability of not picking a red pen? That will be 7 plus 3 equal to 10. And the probability will be 10 divided by 15, which is 2 by 3.


How many black pens are there? 3. So the probability of picking a black pen is 3 by 15 which equals to 1 by 5. And what is the probability of not picking a red pen? That will be 7 plus 3 equal to 10. And the probability will be 10 divided by 15, which is 2 by 3. Alright, now here's a twist. Try this type of question, which is a very CBSE style of question. In a class of 40 students, 25 like cricket, 18 like football and 10 like both.


And what is the probability of not picking a red pen? That will be 7 plus 3 equal to 10. And the probability will be 10 divided by 15, which is 2 by 3. Alright, now here's a twist. Try this type of question, which is a very CBSE style of question. In a class of 40 students, 25 like cricket, 18 like football and 10 like both. What is the probability that a student chosen at random A. Likes only cricket B. Likes at least one of the two games and C. Neither likes cricket nor football.


Alright, now here's a twist. Try this type of question, which is a very CBSE style of question. In a class of 40 students, 25 like cricket, 18 like football and 10 like both. What is the probability that a student chosen at random A. Likes only cricket B. Likes at least one of the two games and C. Neither likes cricket nor football. Whoa! This looks big, right? So let's break this down very slowly. So to begin with, what is the total number of students? 40.


What is the probability that a student chosen at random A. Likes only cricket B. Likes at least one of the two games and C. Neither likes cricket nor football. Whoa! This looks big, right? So let's break this down very slowly. So to begin with, what is the total number of students? 40. So the first part of the question. Only cricket means that they like cricket but not football. So 25 minus 10 is equal to 15. So the probability is 15 divided by 40 which is 3 by 8.


Whoa! This looks big, right? So let's break this down very slowly. So to begin with, what is the total number of students? 40. So the first part of the question. Only cricket means that they like cricket but not football. So 25 minus 10 is equal to 15. So the probability is 15 divided by 40 which is 3 by 8. The second part, at least one means cricket or football or both. So then we use this formula.


So the first part of the question. Only cricket means that they like cricket but not football. So 25 minus 10 is equal to 15. So the probability is 15 divided by 40 which is 3 by 8. The second part, at least one means cricket or football or both. So then we use this formula. Total liking at least one. Cricket plus football minus both. Which is 25 plus 18 minus 10.


The second part, at least one means cricket or football or both. So then we use this formula. Total liking at least one. Cricket plus football minus both. Which is 25 plus 18 minus 10. equals to 33, so the probability will be 33 divided by 40.


Total liking at least one. Cricket plus football minus both. Which is 25 plus 18 minus 10. equals to 33, so the probability will be 33 divided by 40. And the third part of the question, neither means people outside both groups. So, 40 minus 33, which is 7. So, the probability will be 7 by 40.


equals to 33, so the probability will be 33 divided by 40. And the third part of the question, neither means people outside both groups. So, 40 minus 33, which is 7. So, the probability will be 7 by 40. Alright, so a similar question but this time it is your turn. So, in a club of 50 people, 30 like tea, 22 like coffee and 12 like both.


And the third part of the question, neither means people outside both groups. So, 40 minus 33, which is 7. So, the probability will be 7 by 40. Alright, so a similar question but this time it is your turn. So, in a club of 50 people, 30 like tea, 22 like coffee and 12 like both. What is the probability that a person chosen likes only tea? And the second one, a person likes neither.


Alright, so a similar question but this time it is your turn. So, in a club of 50 people, 30 like tea, 22 like coffee and 12 like both. What is the probability that a person chosen likes only tea? And the second one, a person likes neither. Alright, go ahead and try it.


What is the probability that a person chosen likes only tea? And the second one, a person likes neither. Alright, go ahead and try it. Okay, now let's solve this together. The first one, the probability that a person chosen likes only tea. So how many people like only tea?


Alright, go ahead and try it. Okay, now let's solve this together. The first one, the probability that a person chosen likes only tea. So how many people like only tea? 30 minus 12, which is 18. So the probability is 18 divided by 50, which is 9 by 25.


Okay, now let's solve this together. The first one, the probability that a person chosen likes only tea. So how many people like only tea? 30 minus 12, which is 18. So the probability is 18 divided by 50, which is 9 by 25. people liking at least one will be 30 plus 22 minus 12, which is 40.


30 minus 12, which is 18. So the probability is 18 divided by 50, which is 9 by 25. people liking at least one will be 30 plus 22 minus 12, which is 40. And the last one, neither will be 50 minus 40 which is 10. So the probability that the person chosen will like neither tea or coffee is 10 divided by 50 which is simplified to 1 by 5.


people liking at least one will be 30 plus 22 minus 12, which is 40. And the last one, neither will be 50 minus 40 which is 10. So the probability that the person chosen will like neither tea or coffee is 10 divided by 50 which is simplified to 1 by 5. Well done. This is where set logic meets probability. Alright. Now for a question that combines colours and visuals. So,


And the last one, neither will be 50 minus 40 which is 10. So the probability that the person chosen will like neither tea or coffee is 10 divided by 50 which is simplified to 1 by 5. Well done. This is where set logic meets probability. Alright. Now for a question that combines colours and visuals. So, A box has 4 red balls, 3 green balls and 5 yellow balls. All the balls of same colour are identical. One ball is picked at random.


Well done. This is where set logic meets probability. Alright. Now for a question that combines colours and visuals. So, A box has 4 red balls, 3 green balls and 5 yellow balls. All the balls of same colour are identical. One ball is picked at random. What is the probability that the ball A is not green, B is red or yellow and C is green or not yellow?


A box has 4 red balls, 3 green balls and 5 yellow balls. All the balls of same colour are identical. One ball is picked at random. What is the probability that the ball A is not green, B is red or yellow and C is green or not yellow? Alright, let us tackle them one by one and step by step. So, what are the total number of balls? 4 plus 3 plus 5, which is 12.


What is the probability that the ball A is not green, B is red or yellow and C is green or not yellow? Alright, let us tackle them one by one and step by step. So, what are the total number of balls? 4 plus 3 plus 5, which is 12. Now, not green is equal to 4 red balls and 5 yellow balls which is a total of 9 balls which are not green. So the probability is 9 divided by 12 equal to 3 by 4.


Alright, let us tackle them one by one and step by step. So, what are the total number of balls? 4 plus 3 plus 5, which is 12. Now, not green is equal to 4 red balls and 5 yellow balls which is a total of 9 balls which are not green. So the probability is 9 divided by 12 equal to 3 by 4. Now, what is the probability that the ball is red or yellow? So what are the total number of red and yellow balls? 4 plus 5 which is 9. So it's the same answer. 3 by 4.


Now, not green is equal to 4 red balls and 5 yellow balls which is a total of 9 balls which are not green. So the probability is 9 divided by 12 equal to 3 by 4. Now, what is the probability that the ball is red or yellow? So what are the total number of red and yellow balls? 4 plus 5 which is 9. So it's the same answer. 3 by 4. And the last one, what is the probability that the ball is green or not yellow?


Now, what is the probability that the ball is red or yellow? So what are the total number of red and yellow balls? 4 plus 5 which is 9. So it's the same answer. 3 by 4. And the last one, what is the probability that the ball is green or not yellow? Now, not yellow is equal to red plus green, which is 4 plus 3, which is 7. So green is 3, not yellow is 7.


And the last one, what is the probability that the ball is green or not yellow? Now, not yellow is equal to red plus green, which is 4 plus 3, which is 7. So green is 3, not yellow is 7. But both include green. So do not double count them. This is where the confusion lies. And this is a very common mistake. You cannot count the same balls twice. So this is where you will use union.


Now, not yellow is equal to red plus green, which is 4 plus 3, which is 7. So green is 3, not yellow is 7. But both include green. So do not double count them. This is where the confusion lies. And this is a very common mistake. You cannot count the same balls twice. So this is where you will use union. Probability of green union not yellow is equal to green balls plus not yellow.


But both include green. So do not double count them. This is where the confusion lies. And this is a very common mistake. You cannot count the same balls twice. So this is where you will use union. Probability of green union not yellow is equal to green balls plus not yellow. Probability of green plus probability of not yellow minus probability of green union not yellow.


Probability of green union not yellow is equal to green balls plus not yellow. Probability of green plus probability of not yellow minus probability of green union not yellow. So green is 3, not yellow is 7, but both is equal to green is equal to 3. So,


Probability of green plus probability of not yellow minus probability of green union not yellow. So green is 3, not yellow is 7, but both is equal to green is equal to 3. So, Look carefully. It will be 3 plus 7 minus 3, which is equal to 7. So the probability will be 7 divided by 12.


So green is 3, not yellow is 7, but both is equal to green is equal to 3. So, Look carefully. It will be 3 plus 7 minus 3, which is equal to 7. So the probability will be 7 divided by 12. This one makes students stop and think. This is one question that makes people. Now this is one problem that makes students stop and think. And now you've got it.


Look carefully. It will be 3 plus 7 minus 3, which is equal to 7. So the probability will be 7 divided by 12. This one makes students stop and think. This is one question that makes people. Now this is one problem that makes students stop and think. And now you've got it. So, let's review today's concepts one more time.


This one makes students stop and think. This is one question that makes people. Now this is one problem that makes students stop and think. And now you've got it. So, let's review today's concepts one more time. You can solve probability questions using categories, charts, or Venn-style logic. At least 1 is equal to A union B is equal to A plus B.


So, let's review today's concepts one more time. You can solve probability questions using categories, charts, or Venn-style logic. At least 1 is equal to A union B is equal to A plus B. A plus B minus both and neither is equal to total minus A union B.


You can solve probability questions using categories, charts, or Venn-style logic. At least 1 is equal to A union B is equal to A plus B. A plus B minus both and neither is equal to total minus A union B. Don't double count overlapping outcomes. This is very important to keep in mind.


A plus B minus both and neither is equal to total minus A union B. Don't double count overlapping outcomes. This is very important to keep in mind. And stay calm, read, break it down and solve it step by step. Do not make silly mistakes.


Don't double count overlapping outcomes. This is very important to keep in mind. And stay calm, read, break it down and solve it step by step. Do not make silly mistakes. Now, your mission this time is pick three word problems from your book or worksheet that look long or confusing and then break them into total outcomes, what's being asked and favorable outcomes.


And stay calm, read, break it down and solve it step by step. Do not make silly mistakes. Now, your mission this time is pick three word problems from your book or worksheet that look long or confusing and then break them into total outcomes, what's being asked and favorable outcomes. And then say the type of event. Is it a complement, a union or a basic event? And explain it out loud. As if teaching someone else. Because the best way to learn is to teach.


Now, your mission this time is pick three word problems from your book or worksheet that look long or confusing and then break them into total outcomes, what's being asked and favorable outcomes. And then say the type of event. Is it a complement, a union or a basic event? And explain it out loud. As if teaching someone else. Because the best way to learn is to teach. So, in the next lesson, we will go even deeper with probability plus statistics crossover and how to analyze and interpret outcomes. But until then, keep solving, keep exploring. And remember, math isn't just numbers, it's thinking clearly.


And then say the type of event. Is it a complement, a union or a basic event? And explain it out loud. As if teaching someone else. Because the best way to learn is to teach. So, in the next lesson, we will go even deeper with probability plus statistics crossover and how to analyze and interpret outcomes. But until then, keep solving, keep exploring. And remember, math isn't just numbers, it's thinking clearly. Hey there, welcome to class 10 chemistry and today we are diving into one of the most important topics of the year.


So, in the next lesson, we will go even deeper with probability plus statistics crossover and how to analyze and interpret outcomes. But until then, keep solving, keep exploring. And remember, math isn't just numbers, it's thinking clearly. Hey there, welcome to class 10 chemistry and today we are diving into one of the most important topics of the year. chemical reactions and equations. Don't worry, we are not going to memorise equations. We are going to understand what they mean, why they matter and how to recognise them in real life.


Hey there, welcome to class 10 chemistry and today we are diving into one of the most important topics of the year. chemical reactions and equations. Don't worry, we are not going to memorise equations. We are going to understand what they mean, why they matter and how to recognise them in real life. Sounds good? Alright, let's go. So, let's start with the big question. What is a chemical reaction?


chemical reactions and equations. Don't worry, we are not going to memorise equations. We are going to understand what they mean, why they matter and how to recognise them in real life. Sounds good? Alright, let's go. So, let's start with the big question. What is a chemical reaction? Now, a chemical reaction is when one or more substances change to form new substances with different properties. It's like, say, you are baking a cake. You start with flour, sugar and eggs, right? But once it's baked, you don't see eggs anymore. You see something new. You see a cake. That is a chemical reaction.


Sounds good? Alright, let's go. So, let's start with the big question. What is a chemical reaction? Now, a chemical reaction is when one or more substances change to form new substances with different properties. It's like, say, you are baking a cake. You start with flour, sugar and eggs, right? But once it's baked, you don't see eggs anymore. You see something new. You see a cake. That is a chemical reaction. Here's a simpler science example. Magnesium ribbon burns in air and forms a white powder, which is magnesium oxide.


Now, a chemical reaction is when one or more substances change to form new substances with different properties. It's like, say, you are baking a cake. You start with flour, sugar and eggs, right? But once it's baked, you don't see eggs anymore. You see something new. You see a cake. That is a chemical reaction. Here's a simpler science example. Magnesium ribbon burns in air and forms a white powder, which is magnesium oxide. But later, it became something new. Magnesium oxide. So something new is formed. That is the key. Now say it with me. A chemical reaction changes


Here's a simpler science example. Magnesium ribbon burns in air and forms a white powder, which is magnesium oxide. But later, it became something new. Magnesium oxide. So something new is formed. That is the key. Now say it with me. A chemical reaction changes A chemical reaction changes substances into new substances. Come on, now your turn. A chemical reaction changes substances into new substances. So,


But later, it became something new. Magnesium oxide. So something new is formed. That is the key. Now say it with me. A chemical reaction changes A chemical reaction changes substances into new substances. Come on, now your turn. A chemical reaction changes substances into new substances. So, How do you know a chemical reaction is happening? Here are some clues that you can pay attention to. These are real signs that tell you that something is changing.


A chemical reaction changes substances into new substances. Come on, now your turn. A chemical reaction changes substances into new substances. So, How do you know a chemical reaction is happening? Here are some clues that you can pay attention to. These are real signs that tell you that something is changing. There could be a change in colour or formation of a gas. Change in temperature. It might get hot or cold.


How do you know a chemical reaction is happening? Here are some clues that you can pay attention to. These are real signs that tell you that something is changing. There could be a change in colour or formation of a gas. Change in temperature. It might get hot or cold. Formation of a precipitate, a solid that appears in a liquid. And change in smell or energy. Let's do a quick memory check.


There could be a change in colour or formation of a gas. Change in temperature. It might get hot or cold. Formation of a precipitate, a solid that appears in a liquid. And change in smell or energy. Let's do a quick memory check. Ready? Alright, quick question. What are the three signs that a chemical reaction is happening? Come on, say them out loud. Let's see if you remember.


Formation of a precipitate, a solid that appears in a liquid. And change in smell or energy. Let's do a quick memory check. Ready? Alright, quick question. What are the three signs that a chemical reaction is happening? Come on, say them out loud. Let's see if you remember. Okay, did you say color change, gas, temperature change? Perfect! You already know half of it. You already remember it. Now let's see some real examples.


Ready? Alright, quick question. What are the three signs that a chemical reaction is happening? Come on, say them out loud. Let's see if you remember. Okay, did you say color change, gas, temperature change? Perfect! You already know half of it. You already remember it. Now let's see some real examples. So here are some of the chemical reactions that you have probably seen in your daily life. Burning wood, heat, light, new ash, rusting of iron, color change over time.


Okay, did you say color change, gas, temperature change? Perfect! You already know half of it. You already remember it. Now let's see some real examples. So here are some of the chemical reactions that you have probably seen in your daily life. Burning wood, heat, light, new ash, rusting of iron, color change over time. Then, milk turning sour. There is smell change and acidity. Also, cooking an egg. Heat changes it permanently. It can never go back to what it was.


So here are some of the chemical reactions that you have probably seen in your daily life. Burning wood, heat, light, new ash, rusting of iron, color change over time. Then, milk turning sour. There is smell change and acidity. Also, cooking an egg. Heat changes it permanently. It can never go back to what it was. All of these are chemical reactions and you are surrounded by them all the time.


Then, milk turning sour. There is smell change and acidity. Also, cooking an egg. Heat changes it permanently. It can never go back to what it was. All of these are chemical reactions and you are surrounded by them all the time. Now think of one more from your own life and something that you've seen that changes in color, smell and state and then say it out loud. Come on, can you think of something?


All of these are chemical reactions and you are surrounded by them all the time. Now think of one more from your own life and something that you've seen that changes in color, smell and state and then say it out loud. Come on, can you think of something? I saw a chemical reaction when...


Now think of one more from your own life and something that you've seen that changes in color, smell and state and then say it out loud. Come on, can you think of something? I saw a chemical reaction when... Exactly. You are now building your chemistry brain. Now let's move into how to write a chemical reaction in science language using a chemical equation. So let's take this reaction.


I saw a chemical reaction when... Exactly. You are now building your chemistry brain. Now let's move into how to write a chemical reaction in science language using a chemical equation. So let's take this reaction. Magnesium burns in air to form magnesium oxide. So let's write this in a simple word equation first. Magnesium plus oxygen.


Exactly. You are now building your chemistry brain. Now let's move into how to write a chemical reaction in science language using a chemical equation. So let's take this reaction. Magnesium burns in air to form magnesium oxide. So let's write this in a simple word equation first. Magnesium plus oxygen. Equal to magnesium forms magnesium oxide. Alright? Say it with me. Magnesium plus oxygen gives magnesium oxide.


Magnesium burns in air to form magnesium oxide. So let's write this in a simple word equation first. Magnesium plus oxygen. Equal to magnesium forms magnesium oxide. Alright? Say it with me. Magnesium plus oxygen gives magnesium oxide. Now, let's try the same thing using symbols. Now, this is what is a chemical equation. Short, clean and powerful.


Equal to magnesium forms magnesium oxide. Alright? Say it with me. Magnesium plus oxygen gives magnesium oxide. Now, let's try the same thing using symbols. Now, this is what is a chemical equation. Short, clean and powerful. But wait, is this equation balanced? Because it's very important that every chemical equation is balanced. So let's check. On the left, there is one magnesium atom and two oxygen atoms. And on the right, there is one magnesium atom but only one oxygen in MgO.


Now, let's try the same thing using symbols. Now, this is what is a chemical equation. Short, clean and powerful. But wait, is this equation balanced? Because it's very important that every chemical equation is balanced. So let's check. On the left, there is one magnesium atom and two oxygen atoms. And on the right, there is one magnesium atom but only one oxygen in MgO. That means the equation is not yet balanced. So to fix it, we balance the oxygen by adding a 2 in front of MgO and 2Mg on the left. So now the balanced equation is 2Mg plus O2 is equal to 2MgO.


But wait, is this equation balanced? Because it's very important that every chemical equation is balanced. So let's check. On the left, there is one magnesium atom and two oxygen atoms. And on the right, there is one magnesium atom but only one oxygen in MgO. That means the equation is not yet balanced. So to fix it, we balance the oxygen by adding a 2 in front of MgO and 2Mg on the left. So now the balanced equation is 2Mg plus O2 is equal to 2MgO. Now atoms on both sides of magnesium and of oxygen are the same. And this is what we call a balanced equation.


That means the equation is not yet balanced. So to fix it, we balance the oxygen by adding a 2 in front of MgO and 2Mg on the left. So now the balanced equation is 2Mg plus O2 is equal to 2MgO. Now atoms on both sides of magnesium and of oxygen are the same. And this is what we call a balanced equation. Alright, in chemistry, we follow something called the law of conservation.


Now atoms on both sides of magnesium and of oxygen are the same. And this is what we call a balanced equation. Alright, in chemistry, we follow something called the law of conservation. Alright, now why is it important to balance chemical equations? This is a great question. In chemistry, we follow something called the law of conservation of mass. It says that mass cannot be created or destroyed in a chemical reaction. That means the number of atoms of each element must be the same on both sides of the equation.


Alright, in chemistry, we follow something called the law of conservation. Alright, now why is it important to balance chemical equations? This is a great question. In chemistry, we follow something called the law of conservation of mass. It says that mass cannot be created or destroyed in a chemical reaction. That means the number of atoms of each element must be the same on both sides of the equation. So, we balance equation to follow this law, to make sure that the math of the atoms adds up. Are you understanding? Alright, let's say together.


Alright, now why is it important to balance chemical equations? This is a great question. In chemistry, we follow something called the law of conservation of mass. It says that mass cannot be created or destroyed in a chemical reaction. That means the number of atoms of each element must be the same on both sides of the equation. So, we balance equation to follow this law, to make sure that the math of the atoms adds up. Are you understanding? Alright, let's say together. We balance equations to follow the law of conservation of mass. Now repeat it once more on your own. Excellent!


So, we balance equation to follow this law, to make sure that the math of the atoms adds up. Are you understanding? Alright, let's say together. We balance equations to follow the law of conservation of mass. Now repeat it once more on your own. Excellent! Now it is time to practice. Are you ready? Let's try balancing a simple reaction together. So the word equation is hydrogen plus oxygen gives you water.


We balance equations to follow the law of conservation of mass. Now repeat it once more on your own. Excellent! Now it is time to practice. Are you ready? Let's try balancing a simple reaction together. So the word equation is hydrogen plus oxygen gives you water. So the symbol form is H2 plus O2 gives you H2O. H2O is the symbol for water. Now let's count the atoms.


Now it is time to practice. Are you ready? Let's try balancing a simple reaction together. So the word equation is hydrogen plus oxygen gives you water. So the symbol form is H2 plus O2 gives you H2O. H2O is the symbol for water. Now let's count the atoms. On the left side, there are two hydrogen atoms and two oxygen atoms. And two oxygen atoms. But on the right side, we have two hydrogen atoms but only one oxygen atom.


So the symbol form is H2 plus O2 gives you H2O. H2O is the symbol for water. Now let's count the atoms. On the left side, there are two hydrogen atoms and two oxygen atoms. And two oxygen atoms. But on the right side, we have two hydrogen atoms but only one oxygen atom. That means this chemical equation is not balanced and we need to balance it. Oxygen is not balanced. So let's add a 2 in front of H2O.


On the left side, there are two hydrogen atoms and two oxygen atoms. And two oxygen atoms. But on the right side, we have two hydrogen atoms but only one oxygen atom. That means this chemical equation is not balanced and we need to balance it. Oxygen is not balanced. So let's add a 2 in front of H2O. So H2 plus O2 is equal to 2H2O.


That means this chemical equation is not balanced and we need to balance it. Oxygen is not balanced. So let's add a 2 in front of H2O. So H2 plus O2 is equal to 2H2O. Now if we see, oxygen atoms are balanced. There are two oxygen atoms on the left and two oxygen atoms on the right. But now, the hydrogen atoms are not balanced. There are two hydrogen atoms on the left and four on the right.


So H2 plus O2 is equal to 2H2O. Now if we see, oxygen atoms are balanced. There are two oxygen atoms on the left and two oxygen atoms on the right. But now, the hydrogen atoms are not balanced. There are two hydrogen atoms on the left and four on the right. So now we need to fix that by adding 2 in front of H2. So now the final equation is 2H2 plus O2 is equal to


Now if we see, oxygen atoms are balanced. There are two oxygen atoms on the left and two oxygen atoms on the right. But now, the hydrogen atoms are not balanced. There are two hydrogen atoms on the left and four on the right. So now we need to fix that by adding 2 in front of H2. So now the final equation is 2H2 plus O2 is equal to is equal to 2H2O. Now this is a balanced chemical equation.


So now we need to fix that by adding 2 in front of H2. So now the final equation is 2H2 plus O2 is equal to is equal to 2H2O. Now this is a balanced chemical equation. Now, this is a balanced chemical equation. Alright, let's do a quick quiz. What are the two things that you should always check when balancing an equation?


is equal to 2H2O. Now this is a balanced chemical equation. Now, this is a balanced chemical equation. Alright, let's do a quick quiz. What are the two things that you should always check when balancing an equation? Can you think of it? Alright, let's say it out loud.


Now, this is a balanced chemical equation. Alright, let's do a quick quiz. What are the two things that you should always check when balancing an equation? Can you think of it? Alright, let's say it out loud. The answer is the number of atoms and same on both sides. Perfect. So let's review what we learned today.


Can you think of it? Alright, let's say it out loud. The answer is the number of atoms and same on both sides. Perfect. So let's review what we learned today. So the first thing is a chemical reaction creates new substance.


The answer is the number of atoms and same on both sides. Perfect. So let's review what we learned today. So the first thing is a chemical reaction creates new substance. So the first one is, a chemical reaction creates new substances. You can identify it through signs like gas, colour, temperature or smell.


So the first thing is a chemical reaction creates new substance. So the first one is, a chemical reaction creates new substances. You can identify it through signs like gas, colour, temperature or smell. Chemical equations help us write reactions clearly. And we balance equations to follow the law of conservation of mass. And it is very important to always balance the chemical equations.


So the first one is, a chemical reaction creates new substances. You can identify it through signs like gas, colour, temperature or smell. Chemical equations help us write reactions clearly. And we balance equations to follow the law of conservation of mass. And it is very important to always balance the chemical equations. Alright, so now I have a mission for you this week. You will have to find three real-life chemical reactions. It could be anything. Burning, rusting, cooking, anything that you see around. Be attentive.


Chemical equations help us write reactions clearly. And we balance equations to follow the law of conservation of mass. And it is very important to always balance the chemical equations. Alright, so now I have a mission for you this week. You will have to find three real-life chemical reactions. It could be anything. Burning, rusting, cooking, anything that you see around. Be attentive. The second one, you need to write a word equation for each. And then, you have to try writing a simple symbolic chemical equation. And if possible, just balance it out.