Combination Calculator (nCr)
Find how many ways you can choose r items from n items when order does not matter. Uses the nCr = n! / (r!(n-r)!) formula.
Combinations (nCr)
Enter values to calculate
How to Use the Combination Calculator
1
Enter the total number of items (n).
2
Enter how many to choose (r).
3
View the number of combinations.
Frequently Asked Questions
What is a combination?
A selection of items where order does not matter. nCr = n! / (r! × (n-r)!).
Combinations vs permutations?
In combinations, order does not matter (ABC = CBA). In permutations, order matters (ABC is not CBA).
What are real-world examples?
Lottery odds, committee selection, card hands, and choosing subsets from a larger group.