if AuB are disjoint set then AuB
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n(A u B) = n(A) + n(B) when A and B are disjoint sets
n(A u B) = n(A) + n(B) - n (A intersection B) when A and B has common elements
n(A u B) = n(A) + n(B) - n (A intersection B) when A and B has common elements
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