In the series 3, 9, 2, -3, 7, -1, 11, -5, ?, ?, the pattern alternates between two sequences: one increasing by 6 (starting from 3) and the other decreasing by 5 (starting from 9). What are the next two numbers in the series?
In the series 3, 9, 2, -3, 7, -1, 11, -5, ?,…
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