DSSSB · Reasoning

Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which letter-cluster pair does not belong to that group? (Note: Incongruent letter-cluster pairs are not based on the number of consonants/vowels or their position.)

  1. OR-KM
  2. RU-NO
  3. LO-HJ
  4. IL-EG
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