(i) If n(A) = 40, n(AUB) = 60 and n(An B)=10, then n(B) is -
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Step-by-step explanation:
If n(A) = 40, n(AUB) = 60 and n(An B)=10, then n(B) is -
n(AUB)=n(A)+n(B)-n(AnB)
60=40+n(B)-10
60=30+n(B)
60-30=n(B)
So,n(B)=30
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