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Here's a LaTeX-based solution. The macro \mychoose should be used only in "text-style" math mode. (I trust it's not too difficult to adapt it to MathJax.) \documentclass{article} \usepackage[euler-digits]{eulervm} \newcommand{\mychoose}[2]{\bigl({{#1}\atop#2}\bigr)} \begin{document} $\sum_{k=0}^n \mychoose{n}{k}=\mychoose{n}{0}+\cdots+\mychoose{n}{n}.$ ...



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