Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
In a certain lab, chemicals are identified by a color-coding [#permalink]
28 Jun 2005, 16:08
0% (00:00) correct
0% (00:00) wrong based on 0 sessions
This topic is locked. If you want to discuss this question please re-post it in the respective forum.
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?