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# If A and B are tw

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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