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Two set A and B are such that n(A ∪ B) = 21, n(A′ ∩ B′) = 9, n(A ∩ B) = 7, find n(A ∩ B)’. |
Answer» ∴ n(A′ ∩ B′) = n(A ∪ B)’ = 9 we know that, u = n(A ∪ B)’ + n(A ∪ B) = 9 + 21 = 31 ∴ n(A ∩ B)’ =u - n(A ∪ B) = 30 - 7 = 23 |
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