Combination Calculator

In finite mathematics a combination is most typically calculated using the formula C(n,r) = n!/r!(n-r)!. In this formula n represents the total number of items and r represents the number of items to choose. The formula is modified depending on the importance of item order and repeating items in the set of allowed results.

Example: Combination Apple-Orange is the same as Orange-Apple (count once)

Example: Combination Apple-Apple is not allowed (not counted)