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 Easily distinguished codes (Posted on 2005-11-29)
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)

 Subject Author Date partial answer K Sengupta 2007-09-24 10:30:11 re(2): 3+ digits? Tristan 2006-02-26 02:02:53 re: 3+ digits? goFish 2006-02-25 18:04:31 3+ digits? Tristan 2006-02-02 19:22:51 Proof? goFish 2005-12-02 07:42:48 re(2): Spoiler Leming 2005-12-01 12:34:52 re: Clarification required Tristan 2005-11-30 19:05:14 Clarification required goFish 2005-11-30 05:32:24 re: Spoiler Charlie 2005-11-29 14:11:02 Spoiler Leming 2005-11-29 12:00:04 Big, big hint e.g. 2005-11-29 11:02:27

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