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並前往https://www.quora.com/If-A-and-B-are-two-sets-such-that-n-A-15-n-B-21-and-n-AUB-36-what-is-n-AnB

If A and B are two sets, such that n (A) =15, n(B) =21 ... - Quora

n (A)=15 , n(B)=21 , n(AUB)=36 n(AnB)= n(A) + n(B) –n(AuB) n(AnB)= 15 + 21–36 n(AnB)= 0 , set A and set B are disjoint sets.

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