LSAT Logical Reasoning: Complete Guide to Every Question Type
Logical Reasoning makes up the majority of the current LSAT — two full sections of 25–27 questions each, for a total of approximately 50–54 scored LR questions. Getting LR right is the single most important thing you can do to improve your LSAT score.
This guide covers every LR question type, how to recognize each one, and the approach that leads to the right answer consistently. After each practice section, use the LSAT Score Calculator to track how your score is translating to school-tier fit.
How Logical Reasoning Works
Every LR question presents a short stimulus (usually 2–5 sentences), followed by a question stem, followed by five answer choices. You select the best answer. Sounds simple. The challenge is that the LSAT is deliberately testing specific reasoning skills — not general intelligence or reading speed.
Each question type tests a different logical skill. Recognizing the question type from the stem is the first step in answering correctly and efficiently.
The Current LSAT Format (Post-August 2024)
Starting August 2024, LSAC removed the Logic Games (Analytical Reasoning) section. The current LSAT has:
- Two Logical Reasoning sections (each 35 minutes, ~25–27 questions)
- One Reading Comprehension section (35 minutes, 4 passages, ~27 questions)
LR now accounts for roughly 65% of your scored questions. Mastering it is non-negotiable.
The Major LR Question Types
1. Assumption Questions
How to recognize: The stem asks for something that is “assumed,” “takes for granted,” or “is required” for the argument to work.
What you are looking for: The unstated premise that bridges the evidence to the conclusion. The argument cannot work without this assumption.
Strategy: Identify the conclusion and the evidence. Ask: what must be true (but is not stated) to get from this evidence to this conclusion? The correct answer, when negated, should destroy the argument — this is the Negation Test.
2. Strengthen Questions
How to recognize: The stem asks which answer “most strengthens,” “most supports,” or “provides the most support for” the argument.
What you are looking for: An answer that makes the conclusion more likely to follow from the evidence. Often this means supporting the core assumption of the argument.
Strategy: Identify the conclusion. Identify the gap between evidence and conclusion. Look for an answer that closes that gap — directly supporting the assumption that the argument relies on.
3. Weaken Questions
How to recognize: The stem asks which answer “most weakens,” “most undermines,” or “provides the most reason against” the argument.
What you are looking for: An answer that makes the conclusion less likely to follow from the evidence. Often this means attacking the core assumption.
Strategy: Same as Strengthen — identify the gap, then find an answer that widens it. The correct weaken answer does not need to destroy the argument; it just needs to hurt it more than the other choices do.
4. Must Be True / Most Supported
How to recognize: “Which of the following must be true?” or “Which is most strongly supported by the statements above?”
What you are looking for: A conclusion that follows necessarily (or very closely) from the information given. You are not looking for what is probably true or what seems reasonable — only what the given information directly supports.
Strategy: Do not add outside information. The right answer will be entailed by — or at least very tightly supported by — the stimulus alone. Wrong answers often go slightly beyond what the stimulus says.
5. Flaw Questions
How to recognize: “The reasoning in the argument is flawed because…” or “The argument is vulnerable to criticism on the grounds that…”
What you are looking for: A description of the logical error in the argument. Flaw answer choices are written in abstract terms (e.g., “assumes without justification that…,” “confuses a sufficient condition with a necessary one”).
Common flaws to know:
- Correlation/causation confusion
- Treating sufficient conditions as necessary (or vice versa)
- Circular reasoning
- Ad hominem / attacking the source rather than the argument
- False dichotomy (assumes only two options when others exist)
- Composition/division errors
- Sampling bias
6. Parallel Reasoning Questions
How to recognize: “Which of the following arguments is most similar in its reasoning to the argument above?”
What you are looking for: An argument with the same logical structure as the original — same relationship between premise type and conclusion type, same form of reasoning.
Strategy: Abstract the original argument to its logical form (e.g., “All X are Y. Z is an X. Therefore Z is a Y.”) and look for the answer that maps onto that same structure. Ignore content — only structure matters.
7. Point at Issue / Point of Agreement
How to recognize: Two speakers give different views. “The two speakers disagree about…” or “The two speakers agree about…”
What you are looking for: The specific claim on which both speakers have taken opposing (or matching) positions. Both speakers must have clearly stated a view on the correct answer — not just implied it.
Strategy: Use the Commitment Test. For each answer choice, ask: does Speaker 1 have a clear position on this? Does Speaker 2 have a clear position on this? Are those positions opposed (for disagree) or the same (for agree)? The correct answer must satisfy both conditions.
8. Principle Questions
How to recognize: Asks you to identify a general principle that supports the argument, or to apply a stated principle to a specific case.
Two subtypes:
- Identify the principle: Like a Strengthen question — find a general rule that supports the conclusion
- Apply the principle: A principle is stated; find the situation to which it applies
Strategy: For apply-the-principle questions, treat the principle like a conditional statement and test each answer against it. For identify-the-principle questions, treat it like a Strengthen question with an abstract answer.
9. Inference / Complete the Passage
How to recognize: “Which of the following can be properly inferred?” or “Which of the following most logically completes the passage?”
Strategy: Similar to Must Be True. The correct answer follows from the information given without adding new claims. For complete-the-passage questions, look for logical continuation of the direction the stimulus is heading.
How to Practice LR Effectively
- Learn question types first, then practice them in isolation: Spend a week drilling only Assumption questions, then only Strengthen, etc. Drilling one type at a time builds reliable pattern recognition.
- Review every wrong answer: After each practice set, identify what category of error caused each miss — wrong question type identification, missed the conclusion, fell for a trap answer. Track these patterns.
- Time yourself by section, not by question: Do not stop the clock after each question. Practice the full 35-minute section to build pacing intuition.
- Do not skip hard questions: Develop a flag-and-return system. Spend no more than 90 seconds on any question; flag it and come back at the end of the section.
LR Resources Worth Using
- The LSAT Trainer and PowerScore LR Bible — best conceptual foundation for LR
- 7Sage — excellent video explanations for specific PrepTest questions
- Official LSAC PrepTests — always use real questions for timed practice
Next Steps
- Read the LSAT Reading Comprehension guide to master the other major scored section
- Build your prep around a structured LSAT study schedule
- Use the LSAT Score Calculator to track how your improving score translates to school-tier fit
- Check How to Improve Your LSAT Score for a full improvement roadmap