Find odd one among 2,3, 4, 4, 6, 8, 9,12, 16?

Find odd one among 2,3, 4, 4, 6, 8, 9,12, 16 ?

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #68978

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