計算機數學

(4分) Let $A = \{\emptyset, 1, \{1\}, \{1,\emptyset\}\}$, and $P(A)$ denote the power set of $A$. How many of the following statements are TRUE?

• $\{1\} \in A$
• $\{1\} \subseteq A$
• $\{\emptyset\} \in A$
• $\{\emptyset\} \subseteq A$
• $\{1,\emptyset\} \in A$
• $\{1,\emptyset\} \subseteq A$
• $\{\{1\}\} \subseteq P(A)$
• $\{\emptyset,\{1\}\} \in P(A)$
• $\{\emptyset,\{1\}\} \subseteq P(A)$