I have been trying to get to solution for some time now, and it starts irritating me. Anyone?
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2$\begingroup$ All the columns sum to 14, so the answer could be 4. $\endgroup$ – Carl Löndahl Mar 3 '16 at 20:31
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$\begingroup$ @CarlLöndahl I came to the same conclusion but it seems strange that the rows don't have any particular coherence $\endgroup$ – question_asker Mar 3 '16 at 20:32
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$\begingroup$ Thought the same thing. $\endgroup$ – Solocutor Mar 3 '16 at 20:33