After entering the number of elements and selection you want to learn the combination of, press the calculate button.
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What is a combination?
These are selections made within a group of objects, regardless of order. An example is the selection of any 4 cards from a deck of playing cards.
How is the combination calculated?
The sum of the r-element combinations selected from a n-element set, n, greater than or equal to r, is calculated by the following formula.