Free Multifactorials Calculator - Calculates the multifactorial n!^{(m)}

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- factorial
- The product of an integer and all the integers below it
- multifactorial
- generalisation of a factorial in which each element to be multiplied differs from the next by an integer
- permutation
- a way in which a set or number of things can be ordered or arranged.
_{n}P_{r}= n!/(n - r)!