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In a certain lab, chemicals are identified by a color-coding [#permalink]
28 Jun 2005, 17:08
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In a certain lab, chemicals are identified by a color-coding system. There are 20 different chemicals. Each one is coded with either a single color or a unique two color pair. If the order of the colors in the pairs doesn't matter, what is the minimum number of different colors needed to code all 20 chemicals with either a single color or a unique pair of colors?
Is it possible to do this problem without knowing the answer choices (w/ the choices, it is simply a matter of putting them into a quick equation)?
I also had another quick question - I have come across the <> symbol quite often in these boards, such as n<>0 etc. What does <> mean?