DSSSB · Reasoning

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

  1. QOS
  2. GMK
  3. SQU
  4. ECG
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