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The set of all subsets of a given set A is called the power set of A and is denoted by P(A)
  A set with n elements has 2 ^n( 2 power n) subsets.
example: if A = {1,2,3} then 2^3 = 8
P(A) ={{ }( null set), {1},{2},{3},{1,2},{1,3},{2,3},{1,2,3}}
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The power set of a set A is the set of all the subsets of A, and denoted by P(A).
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