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The three letters in each group are evenly spaced, and the groups advance steadily. What follows?
ACE, BDF, CEG, ?

  • A.DEF
  • B.DFH
  • C.EGI
  • D.DFG

Answer: A

Correct answer: DFH

Each triple holds three letters two places apart, and each triple starts one place after the last: A, B, C. The next starts at D, so its letters are D, F and H, giving DFH. Two rules operate together - the internal spacing and the step between triples - and the answer must satisfy both. DEF keeps the correct start but collapses the internal spacing to one. Both the internal spacing and the step between triples must be honoured, and an answer that satisfies only one of them will always be among the options offered.

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