Permutation Calculator
Enter n (total items) and r (items chosen) to calculate the number of ordered arrangements.
Formula
nPr = n! ÷ (n − r)!
Example
Arranging 2 items from a set of 5 gives 20 permutations.
Frequently Asked Questions
- How is this different from combination?
- Permutations count arrangements where order matters (AB is different from BA); combinations don't.
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