A number of 50 digits has all its digits equal to 1 except the 26th digit. If the number is divisible by 13, then find the digit in the 26th place.
(In reply to solution
Of course Charlie got x=3 because his x is the 26th digit from the left end. You and I got x=9 because our x is the 26th digit from the right end. If you look at the number Charlie shows in Comment 3, and count carefully, the 3 is in the 25th digit from the right end (26th from the left end):
Posted by Richard
on 2003-12-31 13:22:37