• anonymous
I was enumerating the elements of the power set of this set S:= {1,2,3,4,5} and I thought that the number of these elements could be obtained with this: $\#\wp S = 1 + \sum_{k=1}^n {n\choose k}$ where $$n=\#S$$ I saw that it holds for this set. But I'm not sure what if it could be applied to a different kind of set.
Mathematics

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