Question

If A and B are two sets. If n(A)=20, n(B)=30 and n(AUB)=40, then find n(AintersactionB). Please answer. 10th. And 12th or 14th if possible.

Answer 1

10 is the answer hope helps u

Answer 2

n(A)-n(B)-(A Interesection B)=n(AUB).
20+30-x=40
50-X=40
X=10