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If the first and second C are indistinguishable, then there are 554,400 permutations. If one is upper case and the other is lower case, then there are twice as many.
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.
the answer is 1.856Etc.