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29. Which letter should replace the question mark?
  IQ test. Free iq test online # 2 with answers and solutions. Question # 29. Which letter should replace the question mark?
 

Explanation:
The alphabetic number of the next letter is divided in half (from left to right). In terms of the alphabetic order of letters. P ÷ 2 = H; H ÷ 2 = D; D ÷ 2 = B.