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6
5040
24680
Assuming whole numbers and a leading zero does not count: 10,234,567
93876
6
1,023,456,789
5040
24680
9,876,543,210 9876543210
9875.
There are 840 4-digit combinations without repeating any digit in the combinations.
Assuming whole numbers and a leading zero does not count: 10,234,567
18, if leading 0s are disallowed.
24
256
93876