Logical Reasoning :: Number Series - Discussion

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Explanation:
Break the series as below
9,12,4,8 | 12,15,5,9 | 3,6,2,6 | 6,9,?,?
9+3=12/3=4+4=8
12+3=15/3=5+4=9
6+3=9/3=3+4=7
Add 3 to 1st digit than divide 3 to 2nd digit than add 4 to 3rd digit.
So, 3 and 7