Which statement must be true if 'No reptiles are mammals' and 'All snakes are reptiles'?
Q1. Which statement must be true if 'No reptiles are mammals' and 'All snakes are reptiles'?
Answer: Some snakes are not mammals.
Explanation: Transitive exclusion applies: Snakes⊂Reptiles⊄Mammals. Some snakes are not mammals is correct because it matches what the question requires. USAT, HAT and MDCAT analytical sections repeat this pattern.