UPSSSC PET · Bite-size lessons
Conclusive Reasoning
About 6 min · Logic & Reasoning · English
Time worked out from the lesson's 429 words at 150 words a minute, plus a minute for each question.
Conclusive reasoning tests your ability to determine whether given conclusions logically follow from stated premises. The three main question types you'll encounter are:
Key ideas
- Logical validity vs factual truth: A conclusion is valid if it necessarily follows from the premises, regardless of real-world accuracy. The statement "All cats are blue. Fluffy is a cat." logically leads to "Fluffy is blue"—even though factually absurd.
- Premises and conclusions are distinct: Premises are given statements assumed true for the question. Conclusions are claims you must test against those premises. Never import outside information.
- Categorical statements in syllogisms: Learn the four types—(1) All A are B (universal affirmative), (2) No A are B (universal negative), (3) Some A are B (particular affirmative), (4) Some A are not B (particular negative). These form the building blocks of syllogistic reasoning.
- Assumptions make arguments complete: An assumption is an unstated premise without which the argument collapses. If a statement says "Students should study daily to score well," the hidden assumption is "daily study improves scores"—this links the action to the outcome.
- Possibility vs certainty: A conclusion is valid only if it must be true, not just could be true. "Some A are B" does not prove "Some A are not B"; that is only a possibility.
Quick reference
- Syllogism shortcut: If both premises are particular ("Some"), no definite conclusion is possible.
- "All" does not convert: "All A are B" ≠ "All B are A."
- "No" converts freely: "No A are B" = "No B are A."
- Assumptions glue logic: If negating a statement breaks the argument, it's an assumption.
- Venn diagrams help: Visual representation prevents abstract reasoning errors.
Check yourself: 3 questions
1. Statement: All teachers are scholars. All scholars are writers. Conclusions: I. All teachers are writers. II. Some writers are scholars.
2. Statement: The government has decided to increase the fare of metro trains by 20 percent to reduce losses. Assumptions: I. People will continue to travel by metro even after fare increase. II. The present fare is insufficient to cover operational costs.
3. Statements: 1. Some books are novels. 2. All novels are stories. 3. No story is a poem. Conclusions: I. Some books are stories. II. No novel is a poem. III. Some poems are books.
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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