00:01
So let's construct a venn diagram to help figure this out.
00:03
So there's students who took only english.
00:08
There's science and music.
00:10
So let's read s and music.
00:12
Okay, so let's start.
00:13
I'm trying to find all the numbers in these spaces here, including the one outside.
00:19
Okay.
00:21
So let's start with which took all three.
00:23
So seven took all three.
00:24
So the intersection of all three.
00:26
15 took english and music.
00:28
So english and music overlapping is just going to be 15.
00:32
That means these two are going to add to 15.
00:35
So 15 minus 7 will be 8.
00:38
9 took science and music...