Free Permutation Calculator
Calculate the number of permutations (ordered arrangements) of n items taken r at a time. Uses the formula P(n,r) = n! / (n-r)!
Permutations
720
N Factorial3,628,800
N Minus R Factorial5,040
How to Calculate Permutations
Formula
P(n, r) = n! / (n - r)!
Where:
Permutations count arrangements where order matters.
Example Calculation
How many ways can you arrange 3 items from a set of 10? (Order matters)
- 01P(10, 3) = 10! / (10-3)!
- 02= 10! / 7!
- 03= 10 × 9 × 8
- 04= 720
Frequently Asked Questions
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