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For on-topic questions involving the mathematical concept of a derivative, i.e. $\frac{d}{dx} f(x)$. For purely mathematical questions about the derivative it is better to ask on math SE https://math.stackexchange.com/

3 votes
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Deriving the PDF of the kth order statistic from the CDF

I understand that I have to take the derivative of F to get f. I also understand the individual parts of f that are explained later in the article. … In general I know that I should be able to differentiate all parts of the sum separately, but probably the binomial coefficient confuses me and why the sum disappears ("the derivative of the sum of two …