n(A)=20, n(B)=30, n(U)=80, n(A intersection B)=10, n(A' union B')=?
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Step-by-step explanation:
N(A)=20 N(B)=30 N(U)=80 N(AnB)=10 N(A'UB')=?
N(A'UB')=N(AnB)' = 1-N(AnB) [ACCORDING TO DEMORGANS LAW
A'UB'=(AnB)'
1-(AnB)=(AnB)]
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