Combinations Calculator
MathCalculates the number of combinations (binomial coefficient) of choosing k items from a set of n items.
How to use this calculator
Start with your values, or try a preset.
Enter Total number of items (n) and Number of items to choose (k) in the units shown.
Read n - k, Factorial of n (n!), Factorial of k (k!), Factorial of (n-k) ((n-k)!), and Number of Combinations (n choose k) in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
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