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Permutation of $$r$$ Objects
## Formula
$$^nP_r=n(n-1)(n-2)\cdots(n-r+1)$$
There are exactly $$r$$ factors.
## Usage
- Useful for direct calculation of permutations without expanding the factorial form.
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Permutation of $$r$$ Objects
## Formula
$$^nP_r=n(n-1)(n-2)\cdots(n-r+1)$$
There are exactly $$r$$ factors.
## Usage
- Useful for direct calculation of permutations without expanding the factorial form.
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