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16. What figure should replace the question mark?
  IQ test. Free iq test online # 2 with answers and solutions. Question # 16. What figure should replace the question mark?
 

Explanation:
Opposite numbers differ by a factor of 4 and - 1. (1 is subtracted from the largest number). (3 × 4 = 12; 12 - 1 = 11).