How does the Combinations Calculator work?

Enter n (total items) and k (items to select) Then: Calculate factorials n!, k!, and (n-k)! Then: Divide n! by the product of k! and (n-k)!.

Can you give an example of how to use the Combinations Calculator?

Example: Input C(5,2) gives a result of 10 (5! / (2! × 3!) = 120 / 12 = 10).

Is the Combinations Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Combinations Calculator?

Our Combinations Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Combinations Calculator

Combinations count the number of ways to select k items from n items without regard to order. Written as C(n,k) or "n choose k", used in probability and statistics.

Difficulty:intermediate

References

›Combination — Wikipedia

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