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Subsets subsets of {1,2,3 } ☑， {I,{2},3}, {1,2},{1,3},{2,3} {1,2,3} [m={1,2,..,n} Power set:2Im={SS [n]} 2= Subsets subsets of { 1, 2, 3 }: ∅, {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3} Power set: [n] = {1, 2,...,n} 2[n] = 2[n] = {S | S ✓ [n]}