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A single rule governs the whole of this run of letters. Apply it once more and give the next term.
B, E, H, K, ?

  • A.M
  • B.O
  • C.L
  • D.N

Answer: C

Correct answer: N

The gap is three places throughout: B(2), E(5), H(8), K(11). Three beyond 11 is position 14, giving N. A useful check is that every term leaves the same remainder on division by three, so the series picks out one letter from each group of three. M at 13 and O at 15 bracket the answer and are the two errors a miscount produces. The three-step gap is the most common in this topic because it produces a long series - nine terms - before the alphabet runs out.

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