Q10 of 162 Page 1

If A and B are two sets such that n(A) = 20, n(B) = 25 and n= 40, then write n.

n(A⋃B)=n(A)+n(B)-n(A⋂B)


∴n(A⋂B)=n(A)+n(B)-n(A⋃B)


∴n(A⋂B)=20+25-40=5


∴n(A⋂B)=5


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