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Circular permutations

When things are arranged in places along a closed curve or a circle, in which any place may be regarded as the first or last place, they form a circular permutation.
The number of ways to arrange n distinct objects along a fixed circle is: In how many different arrangements can 6 ladies persons sit around a table?
6 persons can be arranged in circular permutation as (6 - 1)! = 5! ways, that is: ways.

Enter the number of elements of the set A and the computer will calculate you how many circular permutations of the elements are there? :
Enter (n) =
(n-1)!=