1.

If X and Y are two sets such that X has 40 elements, X∪Y has 60 elements and X∩Y has 10 elements, how many elements does Y have?

Answer»

Given n(X) = 40; n(X∪Y) = 60; n(X∩Y) = 10

n(Y) = n(X∪Y) + n(X∩Y)-n(X)

= 60 + 10 – 40 = 30



Discussion

No Comment Found

Related InterviewSolutions