Statistics
Permutation
What is the Permutation?
Ordered arrangements of r from n
This formula is widely used in statistics applications. Understanding when and how to apply it helps you interpret calculator results correctly and catch input errors before they propagate.
Formula
nPr = n! / (n-r)!
Substitute known values into the formula above. Ensure all variables use consistent units before calculating.
Worked Example
10P3 = 720
Use the linked calculator below to try your own values and see step-by-step working.
When to Use This Formula
Apply the Permutation when you need to ordered arrangements of r from n. It is a standard reference in statistics coursework, professional practice, and our linked calculators.
Tips & Common Mistakes
- Confirm whether you need sample or population formulas.
- Report spread measures alongside averages.
- Always verify critical results independently for engineering, medical, or legal applications.
Related Calculators
Further Reading
Browse the Formula Library for related formulas, or read educational articles on our Blog.