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23. What letter should replace the question mark?
  iq test. Free iq test online # 2 with answers and solutions. Question # 23. What letter should replace the question mark?
 

Explanation:
C = B × B - 1; G = C × C - 2; M = D × D - 3; U = E × E - 4. Each letter corresponds to its position in the alphabet. Originally given letters: B, C, D, E. Number of letters in the alphabet opposite positions equal to the number of letters in the alphabet (B, C, D, E) multiplied by itself, minus 1, 2, 3, 4.