MPESB Group · Bite-size lessons
Syllogism
About 6 min · Reasoning and Aptitude · English
Time worked out from the lesson's 385 words at 150 words a minute, plus a minute for each question.
Syllogism is a topic in the Reasoning and Aptitude section of MPESB exams. It tests your ability to draw valid conclusions from given statements, regardless of real-world truth. The logic is formal—what matters is the structure of the argument, not whether "All cats are dogs" makes sense in reality.
Key ideas
- Statement vs. Conclusion: Statements are given premises (accept them as true). Conclusions are claims you must test against the statements—never add outside knowledge.
- Universal Statements: "All A are B" and "No A is B" apply to the entire group. Universal Affirmative (All) and Universal Negative (No) are definite claims.
- Particular Statements: "Some A are B" and "Some A are not B" apply to at least one member. Particular Affirmative (Some) and Particular Negative (Some not) are partial claims.
- "Some" means "at least one": When a statement says "Some A are B," it could mean one, many, or even all A are B. This is critical for understanding possibilities.
- Definite vs. Possible Conclusions: A definite conclusion must be true in ALL valid Venn diagram representations. A possible conclusion is true in AT LEAST ONE valid representation.
Quick reference
- All = Circle inside Circle | No = Circles apart | Some = Circles overlap
- "Some A are B" always converts to "Some B are A"—both are identical in Venn terms.
- Universal statements (All/No) give definite conclusions; Particular statements (Some) often give no definite conclusion when combined.
- When stuck between two negative conclusions, check for the complementary pair (Either-Or).
- For "possibility" questions: if you can draw even ONE valid diagram where the conclusion holds, it's possible.
Check yourself: 3 questions
1. Consider the statements: All teachers are hardworking. All hardworking people are successful. Which of the following conclusions logically follows?
2. Statements: Some books are notebooks. All notebooks are papers. Conclusions: I. Some books are papers. II. All papers are books. Which conclusion(s) follow?
3. Statements: No flower is red. Some roses are flowers. Conclusions: I. Some roses are not red. II. All roses are red. Which conclusion(s) follow?
This lesson is cut from the topic's note, not rewritten. Fact-checked on 17 Oct 2026: an AI-assisted check of this note against cited sources; the errors it found were corrected that day. Some errors may remain. The questions are from Shishya's validated question bank.
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