Question

# If A and B are two sets such that n (A) = 20, n(B) = 25 and n(A∪B)= 40, then write n(A∩B).

Solution

## The correct option is n(A∪B)=n(A)+n(B)−n(A∩B) n(A∩B)=n(A)+n(B)−n(A∩B) = 20+25-40 = 5

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