00:01
In this problem, we have been given some information about a survey of how many people liked certain movies, and we need to determine how many did not like either of the two given movies.
00:10
Now, let us consider a to be the set of people who like the movie aquaman.
00:16
Let us consider r to be the set of people who like the movie roma.
00:20
First of all, let us determine the number of elements in a, union, r.
00:24
That will be the number of people who like either of the movies or both.
00:27
Now, this will be equal to n of a plus n of r minus n of a intersection r.
00:35
Now, n of a will be 60 because it is said that 60 people like aquaman, 30 like roma, so n of r is 30, and 20 like both, so n of a intersection r will be 20.
00:46
And if we calculate this, we'll end up with 70...