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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 alphabetical 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：
题意理解中的either or
解答：
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提问：
题意理解中的either or
解答：
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阅读723
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