Permutation & Combination Calculator
nPr and nCr, exactRuns locally · nothing uploaded
- Permutations nPr = n! / (n − r)!720
- Combinations nCr = n! / [r! (n − r)!]120
- Permutations with repetition nʳ1,000
- Combinations with repetition C(n + r − 1, r)220
Permutations count order (e.g. president and vice-president); combinations don't (e.g. choosing 2 delegates).
Also works as:ncr calculatornpr calculatorcombinations calculator
How to use
- 1Enter n and r.
- 2Read nPr, nCr and the repetition variants.
- 3Copy the full numbers.
FAQ
Permutation vs combination?
Permutations count order; combinations don't. Picking a president and VP from 10 is 10P2 = 90; picking 2 delegates is 10C2 = 45.
What is 10C3?
10! ÷ (3! × 7!) = 120.