Complete the series: 3, 4, 6, 9, 13, ______?
- 18
- 16
- 15
- 17
Explanation
The series is formed by adding 1, 2, 3, 4, 5, ... to the previous term, so the next difference should be 5, making the next term:
- 3 + 1 = 4
- 4 + 2 = 6
- 6 + 3 = 9
- 9 + 4 = 13
- 13 + 5 = 18
Therefore, the completed series is: 3, 4, 6, 9, 13, 18.
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