![]() When n = r this reduces to n!, a simple factorial of n. Permutation The number of ways to choose a sample of r elements from a set of n distinct objects where order does matter and replacements are not allowed. Combination The number of ways to choose a sample of r elements from a set of n distinct objects where order does not matter and replacements are not allowed. Factorial There are n! ways of arranging n distinct objects into an ordered sequence, permutations where n = r. For this calculator, the order of the items chosen in the subset does not matter. Basically, it shows how many different possible subsets can be made from the larger set. The Combinations Calculator will find the number of possible combinations that can be obtained by taking a sample of items from a larger set. ![]()
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