๐ข Permutation / Combination Calculator
Enter n and r to calculate nPr (permutation), nCr (combination), and n! (factorial).
Formulas
nPr = n! / (n โ r)!
nCr = n! / (r! ร (n โ r)!)
Use permutation when order matters, combination when order does not matter.
Examples
10P3 = 10ร9ร8 = 720 (ordered selection of 3 from 10)
10C3 = 720รท6 = 120 (unordered selection of 3 from 10)