102
There are only two smaller 3-digit numbers and both of them have repeated digits.
none
The largest ten digit number with no repeated digits is '9876543210'.
222335
Since there are only five different digits, a 6-digit number can only be generated if a digit can be repeated. If digits can be repeated, the smallest 6-digit number is 111111.
0123456789
10234567
100,000,000,000
102
The first digit would have to be 1, the remaining digits, zero.
There are only two smaller 3-digit numbers and both of them have repeated digits.
none
102345 is the smallest [positive] 6-digit number with no repeats.
111111. Since there are six digits, there must be a repeated digit, so why not repeat all ones to get the smallest one.
1000000000 or, if negative numbers are permitted, then -9999999999
The largest ten digit number with no repeated digits is '9876543210'.