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Question

If n(A)=50,n(AB)=80,n(AB)=30, then n(BA)=

A
20
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B
30
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C
40
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D
23
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Solution

The correct option is B 30
n(AB)=n(A)+n(B)n(AB)n(B)=80+3050=60n(BA)=n(B)n(AB)=6030=30

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