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Check at least three gaps before settling on the rule, then complete this run of letters.
E, G, J, L, O, ?

  • A.Q
  • B.P
  • C.R
  • D.N

Answer: D

Correct answer: Q

The gaps alternate between two and three: E(5), G(7), J(10), L(12), O(15). The next gap is +2, so the series reaches position 17, which is Q. Every second term advances five places, so the terms at the odd positions are E, J and O - a five-step series in its own right, which is a neat check on the working. The odd-position terms E, J and O climb by five, which confirms the reading without re-examining every gap.

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