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 Dec 3 awarded Popular Question Oct 17 awarded Popular Question Jul 8 accepted How to finding permutations where some elements repeat? Jul 8 comment How to finding permutations where some elements repeat? Oh I get it, because while a repeating element like {1, 1} have N "inner" permutations, there are many places where this can occur, in this example, position [1 2], position [1 3] and position [2 3]. And since these inner permutations don't count, they effectively increased the total permutation count by N times. Thanks a lot! Jul 8 comment How to finding permutations where some elements repeat? Thank you for the fast reply! I think I'm beginning to understand... but why is it divide by the "inner" permutations and not minus the "inner" permutations? Jul 8 asked How to finding permutations where some elements repeat? Sep 24 awarded Autobiographer Feb 12 awarded Notable Question Apr 7 awarded Popular Question Jun 21 awarded Commentator Jun 21 comment Deriving Taylor series for function from geometric series @J.M. I don't actually know how to expand it, it's just given to me and I memorized it. Jun 21 comment Deriving Taylor series for function from geometric series @J.M. Sorry but i don't get it. The last few questions I have been doing is more along the lines of $\frac{1}{3-2z}$ with center at 1. which rearranges to $$\frac{1}{1-2(z-1)}$$ which looks very similar to the geometric series $$\frac{1}{1-z}$$. I substitute 2(z-1) into z from geometric series and get my answer. Jun 21 comment Deriving Taylor series for function from geometric series @J.M. Thanks, but I still don't seem to get how this can be fitted into the Geometric Series, can you elaborate a little please? Jun 21 asked Deriving Taylor series for function from geometric series Jun 21 asked How to Integrate along a path Jun 21 comment Check my solution - Modelling of a spring with Differential Equation @anon thank you for your help, and i'll definitely keep those tips in mind next time i ask a question. Jun 21 revised Check my solution - Modelling of a spring with Differential Equation additional comments Jun 20 revised Check my solution - Modelling of a spring with Differential Equation additional information Jun 20 accepted Plotting a one-sided amplitude spectrum Jun 20 asked Check my solution - Modelling of a spring with Differential Equation