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Combinations & Permutations Calculator
Enter n (total items) and r (items chosen) to calculate both permutations (order matters) and combinations (order doesn't matter).
How to use this tool
- 1Enter n and r.
- 2See P(n,r) permutations and C(n,r) combinations.
Frequently asked questions
When do I use permutations vs. combinations?+
Use permutations when order matters (like arranging a race's finishers); use combinations when only the group selected matters (like choosing a committee).
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