Question

Q1. If X and Y are two sets such that X ∪ Y has 50 elements, X has 28 elements and Y has 32 elements, how many elements does X ∩ Y have?

Answer 1

step by step solution :

P(A∪B) = P ( A ) + P ( B ) − P ( A ∩ B )

apply formula

then see solution in picture