N(a)=60% n(o)=70% N(ano)=400 n(auo)complenment=10 find U and a only

Alpana asked Apr 9, 2022

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Alpana asked Apr 9, 2022

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13 votes

n(A∪B)=n(A)+n(B)−n(A∪B)=50+60−40=70

n(AΔB)=n(A∪B)−n(A∩B)

⇒70−40=30.

Niedved answered Apr 15, 2022

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