Permutation Calculator P(n,r)
Calculate the number of ordered selections of r items from n.
Result
720
P(10, 3) = 720
Result in all units
Step-by-step solution
P(n,r) = n! / (n−r)!
What Is a Permutation?
A permutation is the number of ways a certain number of items can be selected from a group in a specific order. It is used when order matters.
How is it calculated?
How Is It Calculated?
P(n, r) = n! ÷ (n − r)!
- Enter the total number of items n and the number to select r.
For example, arranging 2 of 5 people: 5! ÷ 3! = 20.
Frequently Asked Questions
What is the difference between permutation and combination?
In a permutation order matters, while in a combination it does not; that is why the number of permutations is larger for the same selection.