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Let A and B be two finite sets such that n(A)=20, n(B)=28 and n(A⋃B)=36, find n(A⋂B).Instructions: just write the number in the provided blank.

Question

Let A and B be two finite sets such that n(A)=20, n(B)=28 and n(A⋃B)=36, find n(A⋂B).Instructions: just write the number in the provided blank.

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Solution

n(A⋂B) = 12

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