Permutation and Combination Calculator
nPr and nCr, plus permutations with repetition and multinomial coefficients.
How to Use
- Enter n (total) and r (chosen).
- BigInt arithmetic handles n up to 170+.
Input
Results
Formulas
Permutations
nPr = n! / (n − r)!
Combinations
nCr = n! / (r! · (n − r)!)
With repetition
permutation = n^r · combination = C(n+r−1, r)
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