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

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

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User Full Time Skeleton
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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.

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User FabiF
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