Complete the number series: 7, 6, 5, 9, 3, 12, 1, 15, _______?
- 21
- -3
- -1
- 13
Explanation
The pattern in the series appears to be a decrease of 1, then an increase of 3, repeating:
7 -> 6 (decrease by 1)
6 -> 5 (decrease by 1)
5 -> 9 (increase by 3)
9 -> 3 (decrease by 6, but pattern suggests decrease by 1)
3 -> 12 (increase by 3)
12 -> 1 (decrease by 11, but pattern suggests decrease by 1)
1 -> 15 (increase by 3)
15 -> -1 (decrease by 1)
Therefore, the next number in the series is -1.
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- 15
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