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') =

Let us consider ∪ as a combined set of 70 elements. If A, B are subs

1.	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') =
A.	40
B.	60
C.	30
D.	None of these
Answer» D. None of these

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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') =

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