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Sum of Even-Indexed Combinations
## Formula
$$\sum_{\substack{r=0\\r\text{ even}}}^{n}{}^nC_r=2^{n-1}$$
## Usage
- Used to find the sum of binomial coefficients having even indices.
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Sum of Even-Indexed Combinations
## Formula
$$\sum_{\substack{r=0\\r\text{ even}}}^{n}{}^nC_r=2^{n-1}$$
## Usage
- Used to find the sum of binomial coefficients having even indices.
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