Logical ReasoningDifficulty: Hard

PT119 S3 Q19 Explanation

Tanya would refrain from littering

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

TopicsParallel Flaw

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Stimulus

Tanya would refrain from littering if everyone else refrained from littering. None of her friends litter, and not litter either.

What this question is testing

Parallel Flaw

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence 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
19.

Which one of the following uses flawed reasoning most similar to the flawed reasoning in

Answer choices

  1. Different Flaw4% picked this

    All residents of the same neighborhood have some goals in common. One group of neighborhood residents wants improvements made to a local park, so

    This doesn't have a sampling flaw. It doesn't say, "because this is true of a some X's, it's true of all X's". It says, "because this is true of some X's, it's true of other X's". And the conditional is related to actually making that sampling move, because it's saying that there will be some shared goals among all residents. We don't know of "local park improvements" has to be one of those shared goals, but that's a different flaw than "we don't know if everyone else is doing what Tanya's friends are doing".

  2. Different Flaw6% picked this

    If a talented artist is willing to starve for her career, then her friends should take her choice of profession seriously. Donna’s friends take

    This is a conditional logic flaw that is partly Necessary vs. Sufficient. It's saying, A and B ? C. Donna is C and B. Thus, Donna must be A. This doesn't contain the Sampling error from the original, and the original didn't contain this backwards logic.

  3. Bad Evidence Match Bad Conclusion Match7% picked this

    Herbert will stop selling office supplies in his store if none of his regular customers complains. Some of his regular customers never knew that

    There is a conditional, no regulars complain ? stop selling office supplies If the argument then went, "Some of the regulars haven't complained, thus he still stop selling office supplies", it would match. Instead, it goes "Some of the regulars didn't realize he sold office supplies (mismatch), thus they won't complain (mismatch)".

  4. Opposite Logic14% picked this

    If all whales need to surface for air, then whales must be easy to observe. Blue whales are easily observed, so

    There is a conditional, all whales need surface ? easy to observe If the argument then went, "Some whales need to surface, thus whales are easy to observe", it would match. Instead, it goes "Some whales are easily observed, thus they must surface."

  5. Correct70% picked this

    If all of a restaurant’s customers like its food, it must be an exceptional restaurant. Everyone whom Sherryl consulted liked the food at Chez

    Why this is right

    We've got the conditional, all customers like food ? exceptional restaurant And then we have the sampling move, everyone Sherryl consulted liked the food. And the author acts like that triggers the conditional, and concludes that it's an exceptional restaurant. We're left thinking, people Sherryl consulted ? all customers And maybe some of us are thinking, what a weird way to spell the name Sherryl

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

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