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The letters retreat two places at a time and each carries its own position. Give the next term.
M13, K11, I9, G7, ?

  • A.E7
  • B.F5
  • C.E5
  • D.C5

Answer: B

Correct answer: E5

The letters step back two places at a time - M, K, I, G - and each carries its own alphabet position. The next letter is E, the 5th, giving E5. Checking that the number matches the letter's position is the quickest way to eliminate wrong options: E7 pairs a letter with a position that is not its own. The series is descending, so it will reach the front of the alphabet after two more terms, at C3 and A1.

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