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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(2): solution | Comment 19 of 39 |
(In reply to re: solution by Richard)

It's all very well you doing these complicated methods, but you have to remember that average people are reading this and won't understand what you say! I'm a 17 year old Maths and Further Maths student and have never come across "mod" numers (modulo i believe)...I think that's university level! I think Eric's solution to the 13 problem and my solution to the 11 problem are the most user friendly. They may not be as elegant mathematically - but a darn more people understand what's going on!
  Posted by Kirk on 2003-11-21 16:33:21

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