Ononot — Let the universal set be U = \{x \in \mathbb{Z}^+ : x \le 10

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Set Theoryeasy

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Let the universal set be $U = \{x \in \mathbb{Z}^+ : x \le 100\}$ . Let $F$ be the set of multiples of $5$ , and $S$ be the set of multiples of $7$ . What is the smallest element in the intersection $F \cap S$ ?