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Question

Let A and B be two sets such that n(A) =20 , n(AB)=42 nd n(AB)=4 Find n(B), n(A-B) and n(B-A)

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Solution

n(AB)=n(A)+n(B)n(AB)
n(B)=4220+4=26
n(AB)=n(A)n(AB)=204=16
n(BA)=n(B)n(AB)=264=22

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