DSSSB · Reasoning

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

  1. UV - WX
  2. HI-JK
  3. MN-OP
  4. QR-TU
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