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Q. 55.0( 4 Votes )

If A and B are tw

Answer :

Given: n(A) = 23, n(B) = 37, n(A – B) = 8


Using the hint


n(A) = n(A – B) + n(A B)


23 = 8 + n(A B)


n(A B) = 23 – 8


n(A B) = 15


Visualizing the hint given,



We know that n(A B) = n(A) + n(B) – n(A B)


n(A B) = 23 + 37 – 15


n(A B) = 45


Hence n(A B) = 45


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