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[Problem Solving]

试题详情

题目:

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?

选项:

A、4
B、5
C、6
D、7
E、8

答案:

B

提问:

老师,我错选A,为什么ab、ba不能算作俩组code呢

解答:

点赞0
阅读3077
解答: ken@boost.org.cn

提问:

请问May,in alphabetic order意味着什么呢?意味着这是排列不是组合吗?

解答:

点赞1
阅读2999
解答: 徐小梅老师

提问:

老师,我错选A,为什么ab、ba不能算作俩组code呢

解答:

点赞0
阅读3078
解答: ken@boost.org.cn老师

提问:

不知道该怎么算啊

解答:

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阅读3012
解答: sysadmin老师

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