Ononot — Let the universal set be the set of positive integers \mathb

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Set Theoryeasy

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Let the universal set be the set of positive integers $\mathbb{Z}^+$ . Let $A = \{x \in \mathbb{Z}^+ : x \text{ is a factor of 12}\}$ and $B = \{x \in \mathbb{Z}^+ : x \text{ is a factor of 18}\}$ . Find the set difference $A \setminus B$ .