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Pascal's Triangle
## Formula
The coefficients of:
$$(a+b)^n$$
are:
$$1,\ n,\ {}^nC_2,\ldots,{}^nC_{n-1},\ 1$$
Each interior coefficient satisfies:
$${}^nC_r={}^{n-1}C_{r-1}+{}^{n-1}C_r$$
## Usage
- Used to obtain binomial coefficients quickly and identify symmetry.
