Calculadora de Permutaciones — Fórmula

How to Calculate Permutations

Formula

P(n, r) = n! / (n - r)!

Where:

  • n = total number of items
  • r = number of items being chosen
  • ! = factorial

    • Permutations count arrangements where order matters.

    Ejemplo Resuelto

    How many ways can you arrange 3 items from a set of 10? (Order matters)

    1. P(10, 3) = 10! / (10-3)!
    2. = 10! / 7!
    3. = 10 × 9 × 8
    4. = 720