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Selection and Arrangement Together
## Formula
If $$r$$ objects are first selected from $$n$$ objects and then arranged:
$${}^nC_r\cdot r!={}^nP_r$$
## Usage
- Used when a problem involves both choosing objects and arranging the chosen objects.
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Selection and Arrangement Together
## Formula
If $$r$$ objects are first selected from $$n$$ objects and then arranged:
$${}^nC_r\cdot r!={}^nP_r$$
## Usage
- Used when a problem involves both choosing objects and arranging the chosen objects.
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