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20. What figure should replace the question mark?
  IQ test. Accurate and free online iq test # 3 with answers and solutions. Question # 20. What figure should replace the question mark?
 

Explanation:
First line: -2, -4, -8 (2 raised to (1, 2, 3) power). Second line: -3, -9, -27 (3 raised to (1, 2, 3) power). Third line: -4, -16, -64 (4 raised to (1, 2, 3) power). (94 - 4 = 90; 90 - 16 = 74; 74 - 64 = 10).