Statements: No fish can fly. All sharks are fish. Which conclusion follows?
- A. Some sharks can fly
- B. No shark can fly
- C. All flying things are fish
- D. Some fish are sharks only
Explanation
Sharks lie entirely within fish, and fish are entirely excluded from the flying category, so sharks are excluded too. This is the valid form no A is B, all C are A, therefore no C is B. The exclusion passes down to every subset.
Related questions
If all surgeons are doctors and some doctors are researchers, which conclusion definitely follows?
Statements: All cats are mammals. All dogs are mammals. Conclusion: All cats are dogs. This conclusion is
Statements: Some pens are books. All books are papers. Which conclusion follows?
Statements: No student is careless. Some careless people are drivers. Which conclusion follows?
Statements: Some doctors are writers. Some writers are poets. Which conclusion follows?