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n ! = 1 ⋅ 2 ⋅ … ⋅ ( n − 1 ) n {\displaystyle n!=1\cdot 2\cdot \ldots \cdot \left(n-1\right)n} , 0 ! = 1 {\displaystyle 0!=1}
n ! ≈ n n ⋅ e − n ⋅ 2 π n {\displaystyle n!\approx n^{n}\cdot e^{-n}\cdot {\sqrt {2\pi n}}}