Exercise 1.3.10: Determining if a truth value of a compound expression is known given a partial truth assignment.   The variable p is true, q is false, and the truth value for variable r is unknown. Indicate whether the truth value of each logical expression is true, false, or unknown. (a) p → (q ∧ r) (b) (p ∨ r) → r (c) (p ∨ r) ↔ (q ∧ r) (d) (p ∧ r) ↔ (q ∧ r) (e) p → (r ∨ q) (f) (p ∧ q) → r

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