Combination Calculator
Combinations (nCr)
Calculate the number of combinations of n items taken r at a time
Formula
C(n, r) = n! / (r! x (n - r)!)
Frequently Asked Questions
What is a combination?
A combination is a selection of items where order does not matter. C(n, r) gives the number of ways to choose r items from a set of n items. For example, C(5, 3) = 10.
What is a binomial coefficient?
The binomial coefficient C(n, r) (also written as 'n choose r') appears in the binomial theorem expansion. It equals n! / (r! x (n-r)!).
You may also need
+
Permutation Calculator
Free permutation calculator. Calculate nPr — the number of ways to arrange r items from n items where order matters.
Math%
Percentage Calculator
Free online percentage calculator. Find percentages, percentage change, percentage difference, and more. Fast, accurate, no signup required.
Math