Combination is a type of mathematical operation that involves combining two or more elements to create a new set of elements. It is used to find the number of possible combinations of a given set of elements. Combination is different from permutation, as it does not take into account the order of the elements.

A combination calculator is a tool used to calculate the number of possible combinations of a given set of items. It is used to determine the number of possible outcomes when selecting a certain number of items from a larger set. For example, a combination calculator can be used to determine the number of possible combinations of three items from a set of five items.

To calculate a combination, use the formula nCr = n! / r! (n – r)! where n is the total number of items and r is the number of items being chosen. For example, if you have 10 items and you want to choose 3 of them, the formula would be 10C3 = 10! / 3! (10 – 3)! = 10! / 3! 7! = 120 / (6 * 7) = 120 / 42 = 2.86.

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