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9. What letter should replace the question mark?
  iq test. Fast and free online iq test # 3 with answers and solutions. Question # 09. What letter should replace the question mark?
 

Explanation:
K = C × C + 2; D = A × A + 3; T = D × D + 4; I = B × B + 5. Each letter corresponds to its position in the alphabet. Originally given letters: C, A, D, B. Number of letters in the alphabet opposite positions equal to the number of letters in the alphabet (C, A, D, B) multiplied by itself, add 2, 3, 4, 5.