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seen Dec 16 at 19:46

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comment Flipping heads 10 times in a row
Alex, could you provide your closed form solution? I have recently asked this question myself and your question here was most helpful.
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comment Proving that $\sum_j x^j$ is differentiable $(-1,1)$
Ah, so it converges on every interval $[-\beta, \beta]$ for $|\beta| < 1$? Many thanks for your help @EricAuld
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revised Proving that $\sum_j x^j$ is differentiable $(-1,1)$
added 436 characters in body
Dec
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comment Proving that $\sum_j x^j$ is differentiable $(-1,1)$
Yes but I am not sure how to show that $\sum_j (j+1)x^j$ converges to a finite number for $|x| < 1$?