1. Which of the following statements are true? (a) |N|=|Z|  (b) |N|<|Z| (c) |Z|=א0  (d) |R|>|Z| 2. Which of the following statements are tautologies?  (a) P → Q  (b) P ∧ ¬P  (c) P ∨ ¬P (d) P → P 3. The contrapositive equivalency of ¬Q → P is given by: (a) P → Q  (b) Q → P (c) ¬P → Q  (d) ¬Q→P

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