Fill in the blank with the correct number in this number series…

Fill in the blank with the correct number in this number series: 5, 15, 7, 12, __, 9, 11,... ?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #31801

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