# If A and B are two sets such that n (A ∪ B) = 50, n(A) = 28 and n(B) = 32, find n (A ∩ B).

Given:

n (A B) = 50

n(A) = 28

n(B) = 32

To Find:

n (A B) =?

We know,

n (A B) = n(A) + n(B) – n (A B)

Substituting the values we get

50 = 28+32 – n (A B)

50 = 60 – n (A B)

–10 = – n (A B)

n (A B) = 10.

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