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Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

T_ST_S_U_T_S

  • A.UUSTT
  • B.TUUTS
  • C.TTSTU
  • D.UUTSU

Answer: D

Correct answer: UUTSU

Filling the gaps gives TUS repeated four times: \[ \mathrm{TUS\ TUS\ TUS\ TUS}. \] Reading off the five missing positions in order gives U, U, T, S, U. Once a short repeating block is suspected, the fastest check is to see whether the known letters are consistent with it before testing any option.

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