6
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Six combinations: 123, 132, 213, 231, 312, 321
10
There are 720 combinations if you use each of the digits only once per combination.
3! or 6 combinations can be made from three distinct numbers. For this example they are: 345, 354, 534, 543, 435, 453.
120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.