[計量] GWD-9 Q2
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
請各位指教，謝謝^^
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