作者KOBEII (#81)
看板GMAT
标题Re: [计量] GWD-9 Q2
时间Sun Sep 7 14:48:43 2008
※ 引述《chasethesky (坚持!)》之铭言：
: 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 alphbetical 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
: 答案 B
: 请各位指教，谢谢^^
测试者可用单一字母或两个字母标示，要多少字母才可区分12个测试者
X + C X 取 2 > 12
X 最小必须为 5
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