Permutation & Combination
Math
nPr720
nCr120
About the Permutation & Combination calculator
Use this free Permutation & Combination calculator. Enter n, r and it shows npr, ncr instantly. With the default values, the npr comes to 720.
How the Permutation & Combination calculation works
nPr = n! ÷ (n−r)! when order matters. nCr = n! ÷ (r! × (n−r)!) when it does not.
Tip: Ask whether order matters: a race podium uses permutations, a lottery uses combinations.
Frequently asked questions
What does the Permutation & Combination calculator do?
It takes n, r and instantly calculates npr, ncr.
Is the Permutation & Combination calculator free?
Yes. It is free, needs no signup and runs in your browser, so your numbers are not stored.
Which currency does it use?
Amounts are plain numbers, so use any currency consistently.
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