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

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