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?