Find the invalid no.from the following series 12, 19, 24, 31, 36…

Find the invalid no.from the following series 12, 19, 24, 31, 36, 39

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 #72716

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