Consider all 2^n-1 non-cmpty subsets of the set 11,2,3, ⋯n} . For every such subset we find the product of each of its elements. Sum of all these products is (a) (n 1) ! (b) (n 1) ! 1 (c) (n 1) !-1 (d) n !-2 | Numerade
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