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标题: OG11-紫PS-132 (查不到的難題) [打印本页]

作者: Kath1985    时间: 2010-2-27 16:01
标题: OG11-紫PS-132 (查不到的難題)
OG11-紫PS-132

132. 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 center is uniquely represented by that choice of one or teo colors, what is the minimum number of colors needed for the coding?
(Assume that the order of the colors in a pair does not matter.)

(A) 4
(B) 5
(C) 6
(D) 12
(E) 24

答案:B
兩個問題想問:
1.請問 If 連接的兩個句子是不是翻成--> if 一個center 用單一或兩種顏色代表 且 每個center有一種或兩種顏色, 公司最少可用幾種顏色區分?
2.這題如何解呢?
作者: panysk    时间: 2010-2-27 18:09
1:1
2:2+C(2,2)=3
3: 3+C(3,2)=6
4: 4+C(4,2)=10
5: 5+C(5,2)=15
5种颜色能代表15种>12,所以最少5种颜色
作者: Kath1985    时间: 2010-3-3 14:54
超開心 搭上你的詳解終於想通了 謝謝
作者: bananaw123    时间: 2012-5-16 11:01
本来很纠结,看了你的解释豁然开朗,感激不尽




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