Verbal Reasoning :: Series Completion - Discussion

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Explanation:
2+8+6+2 = 18 => 1+8 = 9
3+1+9+2 = 15 => 1+5 = 6

similarly combination is 9, 6, 3, 9,6,?,9
4+6+9+2 = 21 => 2+1 = 3