GMAT Problem Solving
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Source: GWD
Level: 3
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?
- A 4
- B 5
- C 6
- D 7
- E 8