An online calculator to calculate the number of combinations of n elements taken r a the time.

## Number of Combinations

The number of combinations of n objects taken in groups of r objects at the time is given by

n C r = C(n , r) = n! / [(n-r)! r!]

## How to use the calculator

1 - Enter the positive integers n (total number of objects) and r (the number of objects in each group) and press "enter".

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