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Easily distinguished codes (Posted on 2005-11-29) Difficulty: 4 of 5
A certain company gives each of its clients a 10 digit number as a sort of identification code. As a precaution, any pair of used codes should differ by at least two digits so no one accidentally gives someone else's code.

How many clients can they have before adding digits? Give an example of a set of codes they might use. What if each pair of codes must differ by at least 3 digits? 4? More?

See The Solution Submitted by Tristan    
Rating: 4.5000 (4 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
partial answerK Sengupta2007-09-24 10:30:11
re(2): 3+ digits?Tristan2006-02-26 02:02:53
Solutionre: 3+ digits?goFish2006-02-25 18:04:31
3+ digits?Tristan2006-02-02 19:22:51
Proof?goFish2005-12-02 07:42:48
re(2): SpoilerLeming2005-12-01 12:34:52
re: Clarification requiredTristan2005-11-30 19:05:14
Clarification requiredgoFish2005-11-30 05:32:24
re: SpoilerCharlie2005-11-29 14:11:02
SolutionSpoilerLeming2005-11-29 12:00:04
Hints/TipsBig, big hinte.g.2005-11-29 11:02:27
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