Permutation Calculator
Calculate the number of ways to arrange items in a specific order.
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What is a Permutation?
A permutation is a way of arranging a set of items where the order is important.
Formula (No Repetition)
P(n, r) = n! / (n - r)!
Where 'n' is the total items, and 'r' is the number to arrange.
Formula (With Repetition)
nʳ
Where each of the 'r' positions can be filled by any of the 'n' items.
Use Cases: Arranging books, selecting race finishers, creating unique passwords.