# Formula:KLS:09.14:16

${\displaystyle{\displaystyle{\displaystyle\frac{(-a)^{n}}{n!}C_{n}\!\left(x;a% \right)=L^{x-n}_{n}\left(a\right)}}}$ ## Proof

We ask users to provide proof(s), reference(s) to proof(s), or further clarification on the proof(s) in this space.
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