How does the Permutations and Combinations Calculator work?

Calculates the following: Number of permutation(s) of n items arranged in r ways = _{n}P_{r} Number of combination(s) of n items arranged in r unique ways = _{n}C_{r} including subsets of sets This calculator has 2 inputs.

What 2 formulas are used for the Permutations and Combinations Calculator?

What 4 concepts are covered in the Permutations and Combinations Calculator?

combination

a mathematical technique that determines the number of possible arrangements in a collection of items where the order of the selection does not matter _{n}P_{r} = n!/r!(n - r)!

factorial

The product of an integer and all the integers below it

permutation

a way in which a set or number of things can be ordered or arranged. _{n}P_{r} = n!/(n - r)!

permutations and combinations

What are some example calculations for the Permutations and Combinations Calculator?