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SubjectsReasoningNon-Verbal & AnalyticalChapter 5 — Syllogism5.2 Either-Or & Possibility

Topic 5.2 · Reasoning · Syllogism

Either-Or & Possibility

Either-Or & Possibility is studied as part of "Syllogism" (Non-Verbal & Analytical) in Reasoning. Syllogism tests logical deductions from given statements using Venn-diagram reasoning.

In the examination context, either-or & possibility carries conceptual questions that test both factual recall and analytical understanding. Revise this topic in sequence with the rest of the chapter so that chronological and thematic links are clear.

Important Facts

Some A are B
Overlapping circles
Possibility cases
Follow when not impossible
Either-or
When statements are complementary
All A are B
Venn: A inside B

Key Points

  • All A are B — Venn: A inside B
  • Some A are B — Overlapping circles
  • Possibility cases — Follow when not impossible
  • Either-or — When statements are complementary

Important Names

—Aristotle
Exam-Oriented Notes
  • »Draw Venn diagrams. 'Some' is a subset of 'All' relationships; handle negative statements carefully.

Related topics

5.1 Basic Syllogism5.3 Coded Syllogism5.4 Implication & Equivalence
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