Question

If n(A)=50,n(B)=40andn(AnB)=20then findn(AuB)

Answer 1

n(AuB) = n(A) + n(B) - n(AnB)

n(AuB) = 50 + 40 - 20

n(AuB) = 90 - 20

n(AuB) = 70

I think this is the answer..........I hope it helps you