Statements: All liquids are fluids. Some fluids are gases. Conclusion: Some liquids are gases. This conclusion is
- 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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