Ononot — Let S = \{x \in \mathbb{N} : x \le 20\} be our subset of int

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Set Theorymedium

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Let $S = \{x \in \mathbb{N} : x \le 20\}$ be our subset of interest. Let $E$ be the set of even positive integers, and $D$ be the set of positive integers divisible by $3$ . Find the cardinality of the set $S \setminus (E \cup D)$ .