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

A is a set containing n elements. A subset `P_1` of A is chosen. The set A is reconstructed by replacing the elements of `P_1`. Then a subset `P_2` of A is chosen and again the set A is constructed by replaing the elements of `P_2.` Again a subset `P_3` of A is chosen. One thebasis of above informastionn answere the following question: Number of ways of choosing `P_1,P_2,

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