Statements: No fish can fly. All sharks are fish. Which conclusion follows?
Correct answer: B. No shark can fly
- 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.
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About Syllogisms
Syllogisms use categorical statements such as all, some and no to establish relationships between groups. Questions require checking whether conclusions necessarily follow from the premises, often by mental set relationships or Venn diagrams, and distinguishing valid deductions from conclusions that are merely possible.
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