0, 1, 3, 6, 7, 9, 12, 13, 15, 18,

0, 1, 3, 6, 7, 9, 12, 13, 15, 18, ?. What number should replace the question mark?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #94440

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