UP Police SI Exam 13 Dec 2017 Shift 3 Solved Paper

Question : 102 of 160

Marks: +1, -0

Let us consider ∪ as a combined set of 70 elements. If A, B are subsets of ∪ such that n(A) = 20, n(B) = 30 and n(A ∩ B) = 10 then n (A '∩ B') =