*r*objects from

*n*distinct objects. In doing this we do not care about the order in which the objects are chosen.

You can opt-out at any time. Please refer to our privacy policy for contact information.

For combinations we select *r* objects from *n* distinct objects. In doing this we do not care about the order in which the objects are chosen.

Explore Statistics

- About.com
- Education
- Statistics
- Statistics Formulas
- Formulas for Combinations and Permutations