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| Combination Formula A formula for the number of possible combinations of r objects from a set of n objects. This is written in any of the ways shown below. 
All forms are read aloud "n choose r." | Formula: |  | Note:  , where nPr is the formula for permutations of n objects taken r at a time. | | Example: | How many different committees of 4 students can be chosen from a group of 15? | | Answer: | There are  possible combinations of 4 students from a set of 15. | 
There are 1365 different committees. | See also Permutation, binomial coefficient, factorial | |
| this page updated 15-jul-23 Mathwords: Terms and Formulas from Algebra I to Calculus written, illustrated, and webmastered by Bruce Simmons Copyright © 2000 by Bruce Simmons All rights reserved | |
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