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Find the missing letter in the following series.

A, G, L, P, S, ?

  • A.U
  • B.Y
  • C.X
  • D.W

Answer: A

The missing letter is U.

Write the letters as their positions in the alphabet: A = 1, G = 7, L = 12, P = 16, S = 19. The gaps between them are 6, 5, 4 and 3, falling by one each time.

The next gap is therefore 2, giving 19 + 2 = 21, which is U.

Y (25), X (24) and W (23) would need gaps of 6, 5 or 4, which breaks the falling pattern.

Writing out a few anchor positions (E 5, J 10, O 15, T 20, Y 25) makes series like this quick to check.

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