perplexus.info :: Just Math : 50

50 - Digit Number (Posted on 2003-11-15)

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: 3.0000 (7 votes)

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Correction to Another Approach

| Comment 33 of 43 |

In my solution (see Another Approach), I lost sight of the fact that x gets added to the 1 that's already there, so the correct answer is 9, not 8.

Posted by NK on 2004-02-10 11:21:08

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