would be 12. if you can see everyother number goes up 1. so it like seeing 9, 10, 11,? .in place of the ? if would be 12. and if you see the 4,5,6, goes up 1 too.
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What would be the next number in this series 15 12 13 10 11 8?
59 is the next number in this series.
The pattern is - 5 then +2. 2 and 4 are the next numbers in the series.
12,7,13,8 etc
This looks like a (subtract 5; add 2) series, so the next numbers are: 2, 4, -1, 1