LSAT logical reasoning questions, explained
Twenty-five practice questions written for this library, never real LSAT questions and never from our question bank. Each one comes with a full explanation: why the right answer is right, and why every wrong answer is wrong, with the trap named in plain language.
Flaw
Spot the exact error in the reasoning. These questions ask what went wrong, not whether the conclusion is true.
- confusing correlation with causation - why (B) is right
- treating a necessary condition as sufficient - why (A) is right
- assuming what is true of the parts is true of the whole - why (C) is right
Strengthen
Find the answer that makes the conclusion more likely. Usually it rules out a rival explanation or confirms the link.
- ruling out an alternative explanation - why (D) is right
- confirming the causal link directly - why (B) is right
- supporting a generalization with a representative sample - why (E) is right
Weaken
Find the answer that makes the conclusion less likely. Usually it offers a rival cause or breaks a key link.
- offering an alternative cause - why (C) is right
- exposing an unrepresentative sample - why (A) is right
- showing the plan can backfire - why (D) is right
Necessary assumption
Find the missing piece the argument cannot live without. Deny it and the argument collapses.
- the negation test - why (E) is right
- the cause must be big enough to matter - why (B) is right
- linking the premise to the conclusion - why (C) is right
Sufficient assumption
Find the answer that makes the conclusion follow with certainty. It closes the gap completely.
- closing the gap completely - why (A) is right
- supplying the one decisive fact - why (D) is right
Inference
Find what must be true if the statements are true. The right answer adds nothing new.
- combining two universal claims - why (E) is right
- using the contrapositive - why (B) is right
- most strongly supported: claim the least - why (C) is right
Main point
Find the conclusion itself. Do not confuse it with a premise, even a true one.
- telling the conclusion from a premise - why (A) is right
- the true-premise trap - why (D) is right
Method of reasoning
Describe what the argument did, step by step. The right answer is a plain summary of the machinery.
- refuting with a counterexample - why (E) is right
- reasoning by analogy - why (B) is right
Parallel reasoning
Match the skeleton of the argument, not the topic. Same structure, same flaw or same valid move.
- matching a flawed conditional pattern - why (A) is right
- matching a valid conditional pattern - why (C) is right
Point at issue
Find what the two speakers actually disagree about. Both must take a side, and the sides must collide.
- finding the direct contradiction - why (D) is right
- agreement is not a point at issue - why (E) is right
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Last updated October 12, 2026