Question

Let A and B be two sets such that n(A) = 45, n(B) = 38 and n(A ∪B) = 70, find: n(A - B).

Answer 1

n(A) = 45, n(B) = 38 and n(A∪ B) = 70

We know that,

n(A-B) = n(A ∪B) - n(B)

n(A – B) = 70 – 38 = 32