00:01
In this question, we're given that there are 59 students in a certain college class.
00:07
Of these, 35 are seniors, 36 are psychology majors, and 8 are neither.
00:11
I'm going to let the set s be sample space, a be the set for seniors, and b be the set for psychology majors.
00:22
So we know that number of people in the sample space is 59.
00:28
Number of seniors, there's set a, is 35.
00:33
Number of psychology majors that is in set b is 36.
00:40
Now neither means not in set a or b.
00:46
So it is outside of set a or b.
00:49
So n is times set notation is intercept or is plus set notation is union.
00:58
So a or b, all is union.
01:02
So a union b, but it's neither in this.
01:06
So it's outside of it, so it's prime.
01:09
And that will be 8 .0.
01:14
What does this mean? this means that if you were to draw the venn diagram, this is a and this is b, 8 is outside here, this is your sample space.
01:25
So this means that inside a union b would be 59 minus 8...