



 
Shalev, If you compute first/second, third/fourth, firth/sixth, ... you get
which seems to be a set of increasing fractions. The denominators are 4, 5, 6, ?, 8, and 7 seems to fit in the missing place. The numerators are 2, 5, 8, ?, 14, they seem to be increasing by threes, so the answer would be 11, 7 to give a fraction of 11/7. This is one possible pattern, but there might be many.  


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