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Topic: License plates (Read 916 times) |
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mkaraki
Newbie
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License plates
« on: Jan 9th, 2010, 4:40pm » |
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I searched before posting but I didn't find any reference. Anyways here is the riddle:
A state wants to issue 6-digit license numbers, with the digits from 0 to 9. If every number has to differ from every other number in at least 2 places, what is the maximum number of licenses that it can issue?
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towr
wu::riddles Moderator
Uberpuzzler
Some people are average, some are just mean.
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Re: License plates
« Reply #1 on: Jan 10th, 2010, 8:16am » |
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on Jan 9th, 2010, 4:40pm, mkaraki wrote:| I searched before posting but I didn't find any reference. |
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The default setting only searches up to a year in the past; but it has been posted before that time, here.
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Wikipedia, Google, Mathworld, Integer sequence DB
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