Question

If A and B are two sets such that n(A) = 22, n(B) = 18 and n( A ꓵ B ) = 5 then find

n(A ∪ B)​

Answer 1

n(A)=15, n(B)=21 & n(AUB)=21

n(AUB)=n(A)+n(B)-n(AnB)

36=15+21-n(AnB)

n(AnB)=36–36

n(AnB)=0

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Answer 2

Answer:

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