GWD MATH 17 Q2

shevit · 发表于 2011-6-4 22:33:34

A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetic order.What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?

A.4
B.5
C.6
D.7
E.8

那个两个字母组成的可以对调么？也就是AB,BA是算一个还是算两个呀？如果算两个就选4就好了，算一个就要5。。。答案是5。。。但题目又没说。。

backlighting · 发表于 2011-6-4 22:44:44

题目说了written in alphabetic order，就是不能对调，要按字母表顺序

shevit · 发表于 2011-6-4 22:55:30

题目说了written in alphabetic order，就是不能对调，要按字母表顺序

-- by 会员 backlighting (2011/6/4 22:44:44)

。。。原来是这样~~呵呵，谢谢了

GWD MATH 17 Q2

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