In syllogistic reasoning, a conclusion containing the word all can follow only if
Correct answer: B. both premises are universal
- A. at least one premise is particular
- B. both premises are universal
- C. one premise is negative
- D. both premises are negative
Explanation
A universal conclusion requires universal support, so any particular premise limits the conclusion to some. Two negative premises yield no conclusion at all, which disposes of the last option. These structural rules let many questions be answered without examining the content.
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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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