Permutation and Combination Calculator

Enter the Values(n & r)

Number of sample points in set ( n ).
Number of sample points in each combination ( r ).
Calculating the Number of combinations (n things taken r at a time)

What is Factorial: n! ways of arranging n distinct objects into an ordered sequence, permutations where n = r.

What is Permutations: arrangement of all or part of a set of objects, with regard to the order of the arrangement.

What is Combinations: the number of ways to select a sample of r elements from a set of n distinct objects where order does not matter and replacements are not allowed.