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Let A and B be two sets such that :n (A) = 20, n (A∪ B) = 42 and n (A ∩ B) = 4. Find n (B)

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Best answer

We know, 

n (A ∪ B) = n(A) + n(B) – n (A ∩ B) 

Substituting the values we get 

42 = 20+ n (B) – 4 

42 = 16+ n (B) 

n (B) = 26

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