Permutations Formula

Исто така познат како: nPr Formula, Arrangement Formula

P(n, r) = \frac{n!}{(n-r)!}

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

Што пресметува

Counts the number of ways to arrange r items from a set of n, where ORDER MATTERS.

Симбол	Име	Единица	Опис
n	Total Items	—	Total number of items to choose from
r	Items Chosen	—	Number of items being arranged

1P(5,3) = 5! / (5-3)! = 5! / 2!

2= 120 / 2 = 60

Резултат: 60

Permutations = order matters. Combinations = order doesn't matter.

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

#combinatorics#probability#counting