A permutation is an ordered arrangement of a set of objects.
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By definition, a permutation is a bijection from a set to itself. Since a permutation is bijective, it is one-to-one.
There can be only one permutation of a single number: so the answer is 7.
the answer is 1.856Etc.
Yes.
An instance which is different from the instance before. Windows 7 and Windows Vista are different permutations of the same product.