6
5040
24680
Assuming whole numbers and a leading zero does not count: 10,234,567
256
6
5040
1,023,456,789
24680
9875.
9,876,543,210 9876543210
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
256
24
93876
93,876