1. $\sqrt{3} \in Q$ ( ... ) 2. $\frac{4}{5} \in Z$ ( ... ) 3. $\sqrt{16} \in Q$ ( ... ) 4. $(Q - Z) \subseteq Q$ ( ... ) 5. $\frac{2}{3} \in N$ ( ... ) 6. $(R - Q) \subseteq Q$ ( ... )