Combination calculator: Calculate nCk online

The C command calculates the combination (nCk). The n is the number of all given items and k is the number of what you select from them. Choosing 5 cards from 13 spaded has 13C5 combinations.

If you input C 5 2 in the search form above and the calculator outputs 10 as follows.

The first and second number represents n and k respectively. Both are separated by a space and must be positive integers or 0. The C is a command and capital letter.