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The five terms below advance by a fixed amount. Supply the sixth.
E, J, O, T, ?

  • A.Y
  • B.X
  • C.Z
  • D.W

Answer: D

Correct answer: Y

Each letter is five places beyond its predecessor: E(5), J(10), O(15), T(20). Five past 20 is position 25, which is Y. The positions are the multiples of five, which makes the series easy to verify without reciting the alphabet. Z sits at 26 and is the last letter, so it attracts a guess from anyone who assumes the series must finish at the end. Once the positions are written down, a five-step series is just counting in fives, and the only real risk is mistaking the position of the starting letter.

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