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50 - Digit Number (Posted on 2003-11-15) Difficulty: 3 of 5
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.

See The Solution Submitted by Ravi Raja    
Rating: 3.3333 (6 votes)

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re: solution | Comment 29 of 39 |
(In reply to solution by luminita)

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):
? 11111111111111111111111113111111111111111111111111
  Posted by Richard on 2003-12-31 13:22:37

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