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 Nov 26 revised Probability of a sorted sequence removed broken link Nov 12 accepted How do I compute $\sum_{k=1}^{\infty} k \cdot p^k$ Nov 12 asked How do I compute $\sum_{k=1}^{\infty} k \cdot p^k$ Nov 12 asked Variance of discrete random variable Nov 9 asked Variance of sample mean difference Oct 23 awarded Critic Oct 18 accepted Am I correct in writing the chain rule for univariate functions this way? Oct 18 asked Am I correct in writing the chain rule for univariate functions this way? May 13 awarded Notable Question Sep 18 awarded Popular Question Jul 2 awarded Curious Oct 21 comment Interpolation of a logarithmic function The task is just "find". And I may obviously interpolate and I may obviously min-square. But in the case of interpolation I only need two points, don't I? Oct 21 asked Interpolation of a logarithmic function Sep 9 revised Probability of a sorted sequence added 230 characters in body Sep 8 comment Probability of a sorted sequence Great explanation, thanks! Sep 8 accepted Probability of a sorted sequence Sep 8 asked Probability of a sorted sequence Sep 8 comment Fraction of ordered sequences among all sequences Michael, brilliant result, thanks, though (sorry for bad problem formulation) not what I expected :) I have to think about that one - because I really presumed that $n$ is not a variable but a fixed number (and $k$ as well). Different elements means that the elements inside the sequence are different. Sep 8 accepted Fraction of ordered sequences among all sequences Sep 7 comment Array sort input Yup, distinct. Assume $k > n$.