Ononot — Let U = \{1, 2, 3, 4, 5, 6, 7, 8, 9, 10\} be the universal s

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Set Theorymedium

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Let $U = \{1, 2, 3, 4, 5, 6, 7, 8, 9, 10\}$ be the universal set. Define $A = \{x \in U \mid x ext{ is prime}\}$ and $B = \{x \in U \mid x ext{ is a multiple of } 3\}$ . What is the cardinality of the set $(A \cup B) \setminus (A \cap B)$ ?