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13. What letter should replace the question mark?
  iq test. Fast and free online iq test # 1 with answers and solutions. Question # 13. What letter should replace the question mark?
 

Explanation:
Opposite letters are different in 2 times - 1 (Use the alphabetical sequence of letters).
(U = K × 2 - 1; E = C × 2 - 1; S = J × 2 - 1; I = E × 2 - 1).