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\forall\lambda,\mu\in\mathbb{C},\forall n\in\mathbb{Z}_{\ge0}
{\lambda \choose n}=\frac{\lambda(\lambda-1)(\lambda-2)\cdots(\lambda-n+1)}{n!}\ ,\ \ {\lambda \choose 0}=1
\mathbb{P}
\mathbb{N},\mathbb{Z},\mathbb{Q},\mathbb{R},\mathbb{C}
\mathbb{N}