look-at-this-series:-31,-29,-24,-22,-17,-...-what-number-should-come-next-5e8acf90edea7ddc42735a38

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Look at this series: 31, 29, 24, 22, 17, ... What number should come next?

15
14
13
12

Explanation

This is a simple alternating subtraction series, which subtracts 2, then 5.