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Math
Combinatorics
C(n,k), P(n,k), and n!
Runs locally in your browser
Parameters
Results
- C(n,k)
- 120
- P(n,k)
- 720
- n!
- 3,628,800
n! is exact up to n=20; above that, scientific notation is used.
How it works
Compute combinations C(n,k), permutations P(n,k), and factorial n!.
Who it's for: Statistics students, lottery analysts, and anyone counting arrangements.
C(n,k) counts unordered selections; P(n,k) counts ordered arrangements.
Requires k ≤ n.
n! is shown exactly up to n = 20, then in scientific notation.
How to use
- Enter n (total items) and k (chosen items).
- Read C(n,k), P(n,k), and n! in the results.