2, 7, 8, 3, 12, 9 what comes next

Question

What comes next

Answer 1

Perhaps 4, 17, 10.  If the rule were for each set of three numbers, the next three are formed by

adding one, five & one, respectively, to generate the next three.  See these COLUMNS of groups of three:

2  3   4

7 12 17

8  9  10

 

Answers to problems like this are not unique.