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If n(A u B ) = …

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If n(A u B ) = 25 , n(A)=12, n(A-B)=8 then find the number of elements in AnB
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Rahul Poddar 8 years, 1 month ago

n (A)=n (A-B)+n (AnB), n (AnB)=n (A)-n (A-B), n (AnB)=12-8=4, n (AnB)=4
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