00:01
In this question, we're given that s is the universal sets and a and b are subsets of s.
00:07
So i'm just going to draw the event diagram over here.
00:11
This is s, the universal sets or sample space, and set a and b are over here.
00:18
Now, number of elements in a is 37, so i can write it as n, bracket a, that's 37.
00:26
And number of elements in b is 20.
00:29
So there is number of elements in set b.
00:32
Now number of elements common in a and b.
00:35
Now n is times set notation is intercept or is plus set notation is union.
00:43
So number of elements common in a and b that will be a and n.
00:49
Now n is intersect.
00:51
So there's intersect b.
00:53
So number of elements in a intercept b is 11...