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17. What number should replace the question mark?
  iq test. Fast and free online iq test # 2 with answers and solutions. Question # 17. What number should replace the question mark?
 

Explanation:
First, there are two numbers: 10, 14. Next comes a sequence: (14 + 10) - (14 - 10) - 1 = 19; (19 + 14) - (19 - 14) - 2 = 26; ...; (65 + 48) - (65 - 48) - 6 = 90.