Conjugacy Classes for $S_{3}$.

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I just have a quick question about $S_{3}$. I keep getting $O_{(123)}=\left \{ (123),(132),(213) \right \}$ yet the answer is $\left \{ (123),(132) \right \}$. Is $(132)(123)(132)^{-1}=(312)=(213)$?

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What you did is correct but with a slight mistake: $(132) = (213)$ so you have written the same element twice.