I believe it is: 987,654
10234567
The least possible integer is -98765432. The least possible positive integer is 10234567.
There are twelve possible solutions using the rule you stated.
It would contain of all the number from 1000 to 9998 leaving 9 numbers.
9,876,543
The greatest possible number is 888... (repeating).
987
9876543
9876543
I believe it is: 987,654
I believe it is: 987,654
4321
10234567
Since we want our number to be as large as possible, we have to put the largest digits in the front, in the largest places so they have more value. Therefore, our answer would be 987,654,321.
The least possible integer is -98765432. The least possible positive integer is 10234567.
There are twelve possible solutions using the rule you stated.