In case you still remember your high school calculous, how can I prove that the infinite sum of k(1-x)^(k-1), k from 1 to ∞ is 1/(x^2) ?
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@michael_nielsen@siah That was pretty similar to my answer. The key trick is noting that it's a derivative of terms that sum nicely.
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@michael_nielsen@siah I actually prefer your approach, it's more first principles than the pattern matching I did.Thanks. Twitter will use this to make your timeline better. UndoUndo
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