From left to right, choose the smallest digit for each position. Thus, the first digit would be 1, the second digit 0, the third digit 2, etc.
102,345
10002
1023
19
Well honey, the smallest possible whole number you can make with the digits 3, 6, 1, and 8 is 1368. It's not rocket science, just basic math. So, there you have it, the smallest whole number you can whip up with those digits.
102,345
It is 1,000,002
10002
11223344
1000023 i think
3
.012 i win
wE WANT NEXUS
It is 1,000,002
smallest 8 digit number with three different digits
102 is the smallest three digit number with different digits.
If initial zeros are considered acceptable digits, it is 00001. Otherwise, it is 10000.