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 is the one that does not belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster)7026

  1. NL-WE
  2. DB-NU
  3. KI-TB
  4. HF-QY
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