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Binomial Coefficient as a Product
## Formula
$${}^nC_r=\frac{n(n-1)(n-2)\cdots(n-r+1)}{r!}$$
## Usage
- Useful when $$r$$ is small and direct factorial expansion is inconvenient.
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Binomial Coefficient as a Product
## Formula
$${}^nC_r=\frac{n(n-1)(n-2)\cdots(n-r+1)}{r!}$$
## Usage
- Useful when $$r$$ is small and direct factorial expansion is inconvenient.
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