Question

If A and B are subsets of the universal set X
and n(X) = 50, n(A) = 35, n(B) = 20,
n(A'B') = 5, find
i) n (AUB) ii) n(AB) iii) n(A'NB)
iv) n(ANB)​

Answer 1

1. n(AUB)=n(A)+n(B)-n(A N B)=35+20-5=50