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Question

Let A and B be two sets such that n(A)=20,n(AB)=42 and n(AB)=5. Then, n(BA)=

A
18
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B
20
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C
22
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D
27
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Solution

The correct option is C 22
n(AB)=n(A)+n(B)n(AB)42=20+n(B)5n(B)=27n(BA)=n(B)n(AB)n(BA)=275=22

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