Permutations Calculator
🎲 Statistics & probability. Use the Permutations formula to find permutations, n, r: pick the value you want, type the others, and the answer updates as you go.
Permutations720
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Permutations | no unit |
| n | no unit |
| r | no unit |
Worked example
Find the permutations when n = 10, r = 3.
Using ⁿPr = n!/((n - r)!): Permutations = 720.
Frequently asked questions
What is the formula for Permutations?
ⁿPr = n!/((n - r)!).
What do the letters stand for, and what units are used?
Permutations, n, r.
How do you calculate permutations?
Put the values into ⁿPr = n!/((n - r)!). For example, with n = 10, r = 3, permutations = 720.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (permutations, n, r) and fill in the others: it rearranges the formula for you.
