Permutations Calculator

How to use it

1. Verify that r ≤ n
2. Calculate the factorial of n
3. Calculate the factorial of (n-r)
4. Divide n! between (n-r)!

Common mistakes

• ⚠️ Use r greater that n
• ⚠️ Confusing permutacion is with combinaciones
• ⚠️ Values negative

Worked example

Calculate P(10,3).

The permutacion is cuentan arregthe where the orden SÍ importa.

Input guide