8, 12, 9, 13, 10, 14, 11, ?, ?
14, 11
15, 12
8, 15
15, 19
8, 5
The series follows the pattern of +4, -3 and then again +4, -3 and so on.
So, at the end, 11+4=15, 15-3=12
15,12
Operation (2)
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