00:01
Hello, students have to take three courses, three exams.
00:04
Total number of students is 260, and let's label exams as, yeah, let's label number one as a, number two as b, and number three as c.
00:19
Here, probability of taking, of passing both one and two, or probability of a and b, is 100.
00:32
Sorry, that's number of students which passed a and b.
00:37
Number of students which passed a and c, one and three, is 135.
00:47
And 90 passed two and three.
00:59
And now, let's start drawing this v -n diagram.
01:03
So let's show black as a, blue as b, and red as c.
01:22
Or, maybe we can even label them as one, two, and three.
01:34
So, now, let's label the number of students.
01:50
So here i will highlight the first region, which is one and two.
02:05
And it contains 100 students.
02:15
135 pass one and three.
02:27
Let's use some other color.
02:42
90 pass two and three.
02:53
And 75 pass all three tests.
03:16
All right.
03:17
And here, 125 people pass test two.
03:38
185 people pass test one...