Formula

nPr = n! / (n − r)!, equivalent to multiplying the integers from n − r + 1 through n.

Worked examples

• 5P2 = 5 × 4 = 20.
• 10P0 = 1.
• 10P10 = 3,628,800.

Privacy

The calculation runs locally in the browser.

Limitations

Inputs must be whole numbers with 0 ≤ r ≤ n. Very large exact results can contain many digits, so this version limits n to 1000 for practical browser use.

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