Permutation and Combination Calculator

Counting Arrangements and Selections

Permutations count ordered arrangements. Combinations count selections where order does not matter.

Formulas: nPr = n! / (n-r)! and nCr = n! / [r!(n-r)!].

Understanding Permutations and Combinations

1. What This Calculator Measures

Permutations count ordered arrangements while combinations count unordered selections.

2. How the Calculation Works

The calculator validates non-negative whole numbers and uses factorial relationships to count arrangements and selections exactly.

3. Formula or Rule Used

nPr = n! / (n-r)!; nCr = n! / [r!(n-r)!].

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