Combination Calculator
Enter n (total items) and r (items chosen) to calculate the number of unordered selections.
Formula
nCr = n! ÷ (r! × (n − r)!)
Example
Choosing 2 items from a set of 5 gives 10 combinations.
Frequently Asked Questions
- What's a common use case?
- Combinations are used for things like lottery odds or choosing a committee, where the order of selection doesn't matter.
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