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SOLVED: Subset counting for even numbers – math.stackexchange.com

A R: Let $S$ be a set of twelve integers $\{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12\}$. How many subsets of $S$ are there such that the sum of all the elements in the subset is an odd number? Here's what I ...

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