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n(A1 n B1) =n(AUB) 1
=n(U) - n(AUB) - - - - - - - (1)
n(AUB)=n(A)+n(B)-n(AnB)
=400
(1)=>n(A1 n B1) =700-400
=300
=n(U) - n(AUB) - - - - - - - (1)
n(AUB)=n(A)+n(B)-n(AnB)
=400
(1)=>n(A1 n B1) =700-400
=300
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