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Sum of $$r^2$$ Times Binomial Coefficient
## Formula
$$\sum_{r=0}^{n}r^2{}^nC_r=n(n+1)2^{n-2}$$
## Usage
- Used directly in sums containing $$r^2{}^nC_r$$.
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Sum of $$r^2$$ Times Binomial Coefficient
## Formula
$$\sum_{r=0}^{n}r^2{}^nC_r=n(n+1)2^{n-2}$$
## Usage
- Used directly in sums containing $$r^2{}^nC_r$$.
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