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".
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! / [(nr)! r!]
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