Given sequence: 4, 11, 7, 14, 10, 17, ______, 20.
- 19
- 13
- 14
- 22
Explanation
Given sequence: 4, 11, 7, 14, 10, 17, __, 20
Two alternating series are used:
First series: 4 → 7 → 10 → 13 (+3 each time)
Second series: 11 → 14 → 17 → 20 (+3 each time)
Missing number: 13
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