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This run reverses a very familiar short sequence. Which letter belongs at the question mark?
U, O, I, E, ?

  • A.Y
  • B.B
  • C.D
  • D.A

Answer: C

Correct answer: A

The vowels in reverse order: U, O, I, E and then A. Reading the series forwards gives A, E, I, O, U, which is the familiar sequence, so recognising it depends on being willing to read a series from either end. Y is sometimes counted as a vowel but never appears in this position, and it would in any case belong at the far end of the forward sequence. Reading a series from either end is a habit worth forming, since a pattern that looks obscure forwards is often obvious backwards.

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