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Each number below is paired with the letter standing at that place in the alphabet. What comes next?
2B, 4D, 6F, 8H, ?

  • A.10I
  • B.10J
  • C.12J
  • D.9J

Answer: A

Correct answer: 10J

Each term pairs an even number with the letter at that position in the alphabet: 2 with B, 4 with D, 6 with F, 8 with H. The next even number is 10 and the tenth letter is J, so the term is 10J. Because the letter is fixed by the number, the two halves cannot be counted independently - which is exactly what 10I gets wrong. Because the letter is fixed by the number, the two halves cannot be counted independently, and an inconsistent pairing can be rejected on sight.

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