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Basic Properties of Combinations
## Formula
$$^nC_0=^nC_n=1$$
$$^nC_1=^nC_{n-1}=n$$
$$^nC_r=^nC_{n-r}$$
## Usage
- Used to simplify combination expressions quickly.
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Basic Properties of Combinations
## Formula
$$^nC_0=^nC_n=1$$
$$^nC_1=^nC_{n-1}=n$$
$$^nC_r=^nC_{n-r}$$
## Usage
- Used to simplify combination expressions quickly.
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