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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Somnath
At first you have to know what is power set? In mathematics, the power set (or powerset) of any set S is the set of all subsets of S, including the empty set and S itself. For example:- Power Set of the set {a,b,c} is P(S) = { {0},{a}, {b}, {c}, {a, b}, {a, c}, {b, c}, {a, b, c} } If the original set has n members, then the Power Set will have 2n members. Now see the attached file for solution of your problem.