Statements: All liquids are fluids. Some fluids are gases. Conclusion: Some liquids are gases. This conclusion is
Correct answer: B. invalid
- A. valid
- B. invalid
- C. necessarily true
- D. self evident
Explanation
The gases among fluids need not overlap with the liquids at all, and in reality they do not, so the conclusion does not follow from the premises. This has the same faulty structure as the earlier engineers and unemployed question. Real world knowledge here happens to agree with the logic, but the logic alone settles it.
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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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