Combination Calculator
Calculates the number of selections where order does not matter (nCr).
Lilu Baba's Combination Calculator computes nCr — the number of ways to select r items from a set of n, where order doesn't matter.
How to use this calculator
- Enter the total number of items (n).
- Enter how many are chosen (r).
- nCr updates instantly.
nCr
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FAQ
Combination Calculator — frequently asked questions
nCr = n! ÷ (r! × (n − r)!).
Use combination when the order of selection doesn't matter — like choosing a committee; use permutation when order matters — like ranking finishers.