05A19-PascalsRule.tex

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\pmtitle{Pascal's rule}
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\begin{document}
Pascal's rule is the binomial identity
\[ \binom{n}{k} + \binom{n}{k-1} = \binom{n+1}{k} \]
where $1 \leq k \leq n$ and $\binom{n}{k}$ is the binomial coefficient.
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