Math

Factorial Permutation Combination Calculator

Compute n!, nPr, and nCr for combinatorics and probability problems.

Factorial Permutation Combination Calculator returns n!, nPr, and nCr for counting problems. It is useful in combinatorics, probability setup, and interview prep. The tool prevents arithmetic overflow mistakes from manual calculation steps. Use it to verify counting formulas quickly.

Combinatorics Inputs

Compute n!, nPr, and nCr in one step.

Results

n! = 3,628,800

nPr = 720

nCr = 120

How to use this tool

Enter n and r values for the problem.
Run calculation to get factorial, permutation, and combination results.
Apply the correct output to your probability or counting equation.

Probability learning products

Promote combinatorics books, test-prep courses, and STEM worksheets.

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