作者ptkuo ()
看板GRE_Verbal
标题[计量] 请教一题数学
时间Wed Jul 30 23:16:07 2008
A company that ships boxes to a total of 12 distribution centers
uses color coding to identify each center. If either a single color
or a pair of two different colors is chosen to represent each center
and if each is uniquely represented by that choice of one or two
colors, what is that minimum number of colors need for the coding?
(Assume that the order of the colors in a pair does not matter.)
(A) 4
(B) 5 ---Ans.
(C) 6
(D) 12
(E) 24
可以麻烦大家帮忙解题吗？
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