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Question

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



    Solution

    The correct option is

    n(AB)=n(A)+n(B)n(AB)

    n(AB)=n(A)+n(B)n(AB)

    = 20+25-40

    = 5

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