Logical Reasoning :: Number Series - Discussion

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Explanation:
Make Denominators equal of all
4/6,10/6,19/6,31/6,46/6,64/6,85/6,____
Now the numerators are in series of
4,10,19,31,46,64,85,..
Gap between numbers
+6,+9,+12,+15,+18,+21
So 85+24=109 => 109/6