If A and B are two sets such that n(A only)= 3 , n (B only) = 7 and n (A or B)= 15, then find n[P(A) U P(B)]

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If A and B are two sets such that n(A only )=3n(B only )=7 and n(A or B)=15, then find n[P(A)UP(B)]

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