The whole or a part of the set of objects are arranged in a manner considering the order of management is termed as Permutations. They are generally described as distinct objects taken in a specific time. Here is the Permutation Formula which guides you to calculate the permutations count in a simple manner. This nPr formula requires n and r values for performing calculations. Permutation formula nPr is one of the most used formulae by high-grade school students.