Find a four-digit number with four different digits, that is equal to the number formed by its digits in descending order minus the number formed by its digits in ascending order.

This is actually a good problem, :) I have come to various conclusions about the numbers, and my answer is 6174.

7641
1467
----
6174

I am still working around with how to prove it.

Posted by Gamer on 2003-04-26 05:50:01