Question

Let A and B be two sets such that n(A) = 75, M(B) = 65 and n(A ∩ B) = 45, find: n(A∪ B)

Answer 1

n(A) = 75, n(B) = 65 and n(A ∩ B) = 45

We know that,

n( A ∪B) = n(A) + n(B) – n( A ∩ B) n(A ∪B)

= 75 + 65 – 45

n(A∪B) = 140 - 45 = 95