Permutations ${}^n P_r$ (nPr = n!/(n−r)!: ordered r-tuples from n distinct objects)
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nPr = n!/(n−r)! — ordered r-tuples from n distinct objects
What each symbol means
| Symbol | What it stands for |
|---|---|
| n,r | Non-negative integers, r≤n |
When to use this
All objects distinct; order matters.