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This is a simple math permutation. the answer is 6 factorial which means 6 * 5 * 4 * 3 * 2 * 1 (aka 720)
An instance which is different from the instance before. Windows 7 and Windows Vista are different permutations of the same product.
A permutation is an ordered arrangement of a set of objects.
By definition, a permutation is a bijection from a set to itself. Since a permutation is bijective, it is one-to-one.
In permutations the order of the elements does matter. In combinations it does not.So, the permutations 1,2,3 and 3,1,2 are not the same. But they are the same combination.