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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.
There can be only one permutation of a single number: so the answer is 7.
Any time we compare decimals, except in out dreams/nightmares! We cannot leave the real world purely for the purpose of comparing decimals and return to the real word when we have done that!
the answer is 1.856Etc.