00:00Okay, in this question, there are 70, there are 40 students in class 10.
00:05Okay, example number 7 of probability.
00:08This chapter is very easy.
00:10If you have to take our first video, you can click the link on the i-button button.
00:15Okay, there are 40 students in class 10.
00:18So, when you have probability, the probability is our formula.
00:24What is our formula?
00:26Or, what is the number of outcome?
00:30Okay, divided by number of all possible outcome.
00:34So, there are 40 students.
00:36How many students do this?
00:3640 students.
00:37So, in division, 40 is required.
00:4040 is required.
00:42So, total students, how many are?
00:43Okay, of a school whom 25 girls and 15 are boys.
00:4925 girls and 15 boys.
00:51The class teacher has to select one student as a class representative.
00:58See, we write the name of each student on the separate card.
01:05The card being identical.
01:07Card kya se?
01:08Ek se hi hai.
01:09Then, she put card in a bag and stir them thoroughly.
01:17What is the probability that the name written on the card is the name of one girl?
01:33So, humkoe nessa, probability of girl name.
01:36Probably teacher of girl, probability of g, lipped.
01:39Ihayaka.
01:39Kitna hai girl?
01:40Kitna hai mai paast?
01:41Girl say gata gari bush hai?
01:43Ko sea yah hapa беспahony faay
01:45Girls kya ni hai?
01:47Total?
01:48Number of outcome favorable to E, favorable to E is G, here is E, so here is G, and G event is probability that the name written on the card is the name of girl, and this is the name of girl, and this is the name of girl,
02:09that's the probability for F, and its probability of theeffectority on the card
02:35Probability of boy is equal to total number of boys divided by total number of student.
02:49So favorable outcome 15 divided by total 40.
02:5315 is equal to 5 into 3 divided by 5 into 8.
02:595 to 5, cancel answer again 3 by 8.
03:03Okay?
03:04It's easy.
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