if n(U)=38, n(A)=16, n(A∩B)=12, n(B')=20, find n(AUB)
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n(aUb)= n(a) + n(b) - n(a∩B)
n(a)=16
n(b)=n(u)-n(b')=38-20=18
n(a∩b)=12
then
n(aUb)=16+18-12=22
n(a)=16
n(b)=n(u)-n(b')=38-20=18
n(a∩b)=12
then
n(aUb)=16+18-12=22
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