Pascal's rule - LaTeX4technics

Loading [MathJax]/extensions/TeX/mathchoice.js

1
{n-1\choose·k}·+·{n-1\choose·k-1}·=·{n\choose·
k}\quad\text{for·}1·\le·k·\le·n¶
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${n-1\choose k} + {n-1\choose k-1} = {n\choose k}\quad\text{for }1 \le k \le n$

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