Complete the series; 3, 4, 7, 8, 11, 12, ______?
- 15
- 10
- 18
- 16
Explanation
3+1 = 4
4+3 = 7
7+1 = 8
8+3 = 11
11+1 = 12
12+3 = 15
Last verified on 03-09-2026
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