#9 – Question Mark
What should come in place of the question mark?
-1, -3, -1, 11, 39, ?, 167, 279, …
The Prize for This Question: Rubik’s Revolution 3” Cube With LED and Sound Effects
The Winner of Puzzle #7: Beyza Doğan
Send your answer to ieee.bilkent.edu.tr/zeka to submit your answer online, and get a chance to win the prize!
This question was prepared by Emrehan Halıcı, president of the Turkey Intelligence Foundation, for Bilkent IEEE.