Question

If n(A) =20,n(B)=50,n(AuB)=60and n(B)=. Find n (AuB) and n(U)

Answer 1

Answer:

n(U)=50,n(A)=20

n(A∪B)=18 n(B−A)=?

So, n(A∪B)=n(0)−n(A∪B)

So. n(A∪B)=32

n(B−A)=n(A∪B)−n(A)

=32−20

n(B−A)=12