Logical ReasoningDifficulty: Easy

PT110 S2 Q3 Explanation

Restaurant manager: In response to

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsFlaw

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Restaurant manager: In response to requests from our patrons for vegetarian main dishes, we recently introduced three: an eggplant and zucchini casserole with tomatoes, brown rice with mushrooms, and potatoes baked with cheese. The first two are frequently ordered, but no one orders the potato dish, Clearly, then, our patrons prefer not to eat potatoes.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
3.

Which one of the following is an error of reasoning in the

Answer choices

  1. Bad Conclusion Match2% picked this

    concluding that two things that occur at the same time have

    Is the conclusion saying that "two things have a common cause"? We know the author is saying that "people's dislike of potatoes is causing the potato and cheese dish to not sell well". Is it causing some second thing as well? No, the author is never saying that two things are caused by a dislike of potatoes. This answer is describing an argument that sounds like, "X and Y both started happening around the same time. Thus, the same thing must be responsible for both X and Y."

  2. Not Self-Contradiction3% picked this

    drawing a conclusion that is inconsistent with one premise of

    This answer alludes to one of the 10 Famous Flaws, Self-Contradiction, in which something the author says early on undermines something they say later on. The word "inconsistent" means contradictory. These answers are almost always wrong. The conclusion is that "our patrons prefer not to eat potatoes", so this answer is saying there was a premise that said, "Our patrons love to eat potatoes!", which of course there was not.

  3. Irrelevant Distinction5% picked this

    ignoring possible differences between what people say they want and what

    People said they wanted vegetarian entree options. And ever since the restaurant introduced three such options, people have "frequently" ordered two of them. So there isn't a mismatch between what people say they want and what they choose. It sounds like they said they wanted vegetarian entrees and have frequently been choosing vegetarian entrees.

  4. Bad Evidence Match2% picked this

    attempting to prove a claim on the basis of evidence that a number of people hold that

    The author is attempting to prove the claim that "our patrons prefer not to eat potatoes". Is the evidence stating that "a number of people claim that it's true that patrons prefer not to eat potatoes"? Definitely not. The evidence is that the potato meal is never ordered while the non-potato meals are frequently ordered.

  5. Correct88% picked this

    treating one of several plausible explanations of a phenomenon as the

    Why this is right

    This is another way of saying the author "failed to consider alternate explanations". How come no one orders the potato and cheese dish? - maybe they don't like potatoes - maybe they don't like cheese - maybe they don't like that combination - maybe the other two entrees simply look more enticing There are many potential ways to explain why no one is ordering this dish, but this author overconfidently acts like "potato-hating" is the only possible explanation.

    Skill tested: Flaw · how this choice captures the argument's function is the move to repeat next time.

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free