Question

What is the value of `n(AnnB)` if `n (A)= 7, n(B)= 9`, and `n(AuuB)=13`?

Answer 1

The answer is `n(AnnB)=3`

Explanation:

We use the following

`n(AuuB)=n(A)+n(B)-n(AnnB)`

Therefore,

`13=7+9-n(AnnB)`

`n(AnnB)=7+9-13=3`