Permutations Formula
Conosciuto anche come: nPr Formula, Arrangement Formula
P(n, r) = \frac{n!}{(n-r)!}
P(n,r) = n! / (n-r)!Cosa calcola
Counts the number of ways to arrange r items from a set of n, where ORDER MATTERS.
variabili
| Simbolo | Nome | Descrizione |
|---|---|---|
| n | Total Items | Total number of items to choose from |
| r | Items Chosen | Number of items being arranged |
Esempi lavorati
1
P(5,3) = 5! / (5-3)! = 5! / 2!2
= 120 / 2 = 60Risultato: 60
Errori comuni
Permutations = order matters. Combinations = order doesn't matter.
Prova una calcolatrice
Formule correlate
#combinatorics#probability#counting