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you can choose from 3, 4, 5, 6 and 7 and can place them on 3 digits

so 5 options over 3 digits. so 5*5*5 = 125 numbers

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If you're not allowed to use the same digit twice, then

The first digit can be any one of the five. For each choice ...

The second digit can be any one of the remaining four. For each choice ...

The third digit can be any one of the remaining three.

Total number of different arrangements = 5 x 4 x 3 = 60 .

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