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S is a set containing n elements. A subs...

S is a set containing n elements. A subset AS of S is selected . The set S is reconstructed by replacing the elements of A.A subset B of S is now selected. If the numer of ways of selecting subsets A and B of S such that `AcapB=phi` is 81, then n= (A) 3 (B) 4 (C) 5 (D) none of these

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