B) equals • If n(A) = 110, n(B) = 300, n(A - B) = 50, then n( A

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( eta(A)=110 quad n(A-B)=50 ) ( n(B)=300 ) ( n(A-B)=n(A cup B) ) ( n(A cup B)=n(A)+n(B)-n(A cap B)-0(B) ) ( n(A B)+n(B)=n(A)+n(B)-n(A cap B) ) ( 50+300=110+300-n(A cap B) ) ( n(A cap B)=410-350=60 ) Acconding, to eq ( 0 n(A cup B)=350 )

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