If 'No reptiles are mammals' and 'All lizards are reptiles', which conclusion is logically valid?
Q1. If 'No reptiles are mammals' and 'All lizards are reptiles', which conclusion is logically valid?
Answer: No lizard is a mammal
Explanation: B follows by syllogism. A contradicts premises via transitivity. USAT, HAT and MDCAT analytical sections repeat this pattern.