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 of the following 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. PQ-FB
  2. YZ-OP
  3. GH-WS
  4. ST-IE
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