LSAT Trap Answers: The 7 Wrong-Answer Types to Spot

Most wrong LSAT answers are not random. They fall into a small set of trap patterns: out of scope, opposite, too extreme, half-right, and a few others. Learn to name the trap, and elimination gets faster and more reliable, because you stop debating answers that were never contenders.

What are the most common LSAT trap answers?

Most wrong LSAT answers are not random guesses by the test writers. They are built from a small set of patterns that show up again and again, in Logical Reasoning and in Reading Comprehension. Once you can name the pattern, you can eliminate an answer in seconds instead of debating it for a minute. The seven patterns below cover the large majority of traps you will meet.

The quick test for every answer is the same: does it do the exact job the stem asks, at the exact strength the evidence supports, about the exact subject the stimulus discusses? If any one of those three fails, the answer is a trap, no matter how familiar it sounds.

Worked example: spot the traps in one question

Consider this original, LSAT-style argument. It is not a real LSAT question.

A city council member argues: ridership on the city bike-share program rose 40 percent last year, so the city should double the number of stations. The increase shows residents want more cycling options, and more stations will make the program easier to use.

Suppose the question asks which answer most weakens the argument. Here is how each trap might appear:

• Out of scope: “Scooter rentals in a neighboring city fell last year.” The neighboring city was never discussed.
• Opposite (180): “New stations in busy neighborhoods would attract still more riders.” That strengthens, rather than weakens.
• Too extreme: “No resident will ever use a bike-share station.” The argument never claims anything that absolute, and this claim goes far beyond the evidence.
• Half-right: “Ridership rose, but only because a one-time festival offered free rides.” Wait, that one actually weakens. A real half-right version would be: “Ridership rose in one neighborhood.” That is consistent with the argument and does not undermine the overall rise.
• Switched elements: “More stations caused the ridership increase last year.” The argument claims the increase justifies more stations, not the reverse, and the timing is backwards.

Notice what the traps have in common: each one borrows something real from the argument, a word, a trend, or a true-sounding claim, and then changes the job, the strength, or the subject. Spotting the change is the whole skill.

A 20-second elimination routine

Use this routine on every question once you have predicted, even roughly, what the right answer should do:

1. Restate the job. Say the stem in your own words: strengthen, weaken, must be true, flaw, and so on. Many opposite traps survive only because the job was never restated.
2. Check scope first. Cross out any answer about a group, place, or comparison that never appeared. Scope traps are usually the fastest eliminations.
3. Check strength second. Compare always, never, and all against the evidence. If the evidence says some, an answer saying most is already suspect.
4. Check the subject last. Ask whether the answer is about the conclusion or merely about a premise, a detail, or a different claim. True-but-irrelevant answers fail here.

If an answer survives all three checks, it is a contender. If two answers survive, compare them head to head on the same three checks rather than on which one sounds smarter. For a fuller routine by question type, see our Logical Reasoning question types guide.

How traps change by question type

The same seven patterns appear everywhere, but the most common trap depends on the question:

• Strengthen and weaken: opposite answers are the biggest danger. A strengthen answer that actually weakens, or the reverse, is the classic 180 trap. Our strengthen and weaken guide walks through the distinction.
• Must be true and inference: too-extreme and out-of-scope answers dominate. The credited answer must be forced by the stimulus, so anything that merely could be true is a trap.
• Flaw: right-answer-wrong-question traps are common. An answer may describe a real feature of the argument without describing its actual flaw. See our flaw question guide for the flaw patterns themselves.
• Reading Comprehension: true-but-irrelevant and half-right answers dominate, because passages contain many verifiable details. An answer can be supported by the passage and still fail to answer the question, especially on main-point and detail questions.

Traps that are not traps

Over-eliminating is a real risk once you learn these patterns. Three cautions keep the routine honest:

• Strong wording is sometimes correct. If the stimulus itself uses always or never, or the question asks for a necessary condition, a strong answer may be exactly right. Check strength against the evidence, not against a blanket rule.
• Broad wording is sometimes correct. Main-point and primary-purpose answers are supposed to be broader than any single detail. Do not eliminate a main-point answer just because it is general.
• Unfamiliar wording is not a trap. A credited answer often paraphrases the stimulus rather than repeating its words. Judge the meaning, not the vocabulary match.

When in doubt, return to the stem. The stem defines the job, and the job decides whether a strong, broad, or unfamiliar answer is a trap or the credited answer.

How to train trap-spotting

Trap-spotting improves fastest when you review by trap type, not just by right or wrong. After each timed section or drill set, log every miss with the trap that caught you: scope, opposite, extreme, half-right, wrong question, switched, or irrelevant. After a few sets, one or two traps will account for most of your misses, and that is your drill target. Our mistake-tracking guide shows a simple five-field log that makes this pattern visible in a week or two.

Then drill in two passes. First, do a set untimed and write the trap name next to every answer you eliminate. Second, redo the same set timed and check whether you still name the trap under the clock. If a trap only appears under time pressure, it is a pacing problem, not a knowledge problem, and the fix is the elimination routine above, practiced until it is automatic. As of November 2026, Jurly's free tier gives you 15 original LSAT-style questions a day to practice on, with explanations for every answer.