# Combinations Calculator

 

An online calculator to calculate the number of combinations of n elements taken r a the time whose formula is given below.

## Use of Combinations Calculator

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

 C(2 , 2)

## Formula for the 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!]