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Count into the alphabet by the number shown to check each term, then complete the run.
5E, 10J, 15O, 20T, ?

  • A.25X
  • B.30Y
  • C.24Y
  • D.25Y

Answer: C

Correct answer: 25Y

The numbers climb in fives and each letter stands at the matching alphabet position: 5 is E, 10 is J, 15 is O, 20 is T. The next number is 25 and the 25th letter is Y, giving 25Y. The series stops naturally here, since a further five would pass the end of the alphabet. 25X pairs the right number with the letter one place short. The series stops naturally at 25, since a further five would carry it past the end of the alphabet with no letter to pair.

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