00:01
Hello, in this question we are given that out of the total 100 students, okay, there are, let me draw it on the venn diagram, okay, so there are total 100 students out of which few of them take mathematics, few of them take chemistry and some of them takes both.
00:19
So, when diagram will be something like this.
00:23
Okay, so we will start with the intersection first.
00:27
So 10 of them are taking mathematics and chemistry.
00:30
So the this value is 10 and 30 of them are taking mathematics.
00:38
So remaining this is if this was m and this was chemistry.
00:41
So 20 would be here and 20 are taking chemistry then 10 would be here.
00:48
Now 10 plus 10 counts to 20 chemistry and 20 plus 10 counts to 30 mathematics.
00:54
Okay.
00:55
So now the question says and the remaining would be 20 plus 10 30 plus 40 remaining would be 60 students.
01:02
So now the question says we need to find the probability that the student is taking mathematics or chemistry...