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Vandermonde's Identity
## Formula
$$\sum_{r=0}^{k}{}^mC_r{}^nC_{k-r}={}^{m+n}C_k$$
## Usage
- Used to simplify sums containing products of two binomial coefficients.
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Vandermonde's Identity
## Formula
$$\sum_{r=0}^{k}{}^mC_r{}^nC_{k-r}={}^{m+n}C_k$$
## Usage
- Used to simplify sums containing products of two binomial coefficients.
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