Ononot — Consider a universal set U = \{1, 2, \dots, 20\}. Let A = \{

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Set Theoryhard

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Consider a universal set $U = \{1, 2, \dots, 20\}$ . Let $A = \{x \in U \mid x ext{ is a multiple of } 3\}$ , $B = \{x \in U \mid x ext{ is a multiple of } 5\}$ , and $C = \{x \in U \mid x ext{ is a prime number}\}$ . Determine the cardinality of the set $(A \cap B) \setminus C$ .