Logical ReasoningDifficulty: Easy

PT127 S3 Q1 Explanation

Anna: Did you know that rainbows

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

TopicsFlaw

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Stimulus

Anna: Did you know that rainbows always occur opposite the sun, appearing high in the sky when the sun is low, and low in the sky when the sun is high? The Roman scholar was so, in the first century A.D.

William: His claim cannot be correct. After all, Pliny the Elder wrote that there are tribes of dog­headed people and beings with no heads or necks but with eyes on their on your forehead cures headaches!

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
1.

William's argument against Anna's claims about rainbows is most vulnerable to criticism

Answer choices

  1. Bad Conclusion Match / Not Straw Man1% picked this

    inappropriately distorts Anna's conclusion, making it appear more extreme than it

    William doesn't distort Anna's conclusion. He doesn't really even take it head-on. He just tries to invalidate Pliny as a source of true beliefs, given that he has previously been a source of false beliefs. This answer choice describes a flaw people call Straw Man. Karen: The minimum wage hasn't risen in the past ten years, while cost of living goes up 2% per year. Thus, we should raise the minimum wage. Patrick: Well, I don't think we should just give free money to everyone. People need to be encouraged to work their way past entry level jobs that pay minimum wages.

  2. Trap1% picked this

    takes for granted that Pliny the Elder was in bad faith when he reported

    Too Strong / Out of Scope: "bad faith" William is assuming that Pliny was incorrect when he reported about unheard-of creatures, but he doesn't need to assume that Pliny was acting in bad faith, i.e. lying about them. Pliny might be a guy that hears bad info, genuinely believes it, and passes it on in good faith. William would still say, "His track record sucks. Let's not believe him when it comes to rainbows."

  3. Correct97% picked this

    illicitly infers that, because Pliny the Elder made some incorrect assertions, Pliny the Eider's assertions about

    Why this is right

    When a Flaw answer choice is structured in two parts, representing the Premise to Conclusion/Assumption move, we can just try matching it up. The author infers that, because [premise], [conclusion]. Is the premise that Pliny made some incorrect assertions? Yes, essentially. Is the conclusion that Pliny's assertions about rainbows are also wrong? Yes.

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

  4. Bad Premise Match0% picked this

    accepts the assertions of an ancient scholar without presenting contemporary verification of

    William does not accept the assertions of Pliny as being valid. He is presenting them as obviously-false ideas, so we're not mad at William for failing to get contemporary science to sign off on Pliny's crazy ideas.

  5. Bad Premise Match0% picked this

    implies that Pliny the Eider's writings are too outdated to be

    The author isn't saying, "Don't listen to Pliny, he's too old to be valuable." He's saying, "Don't listen to Pliny, he's said too many crazy things to be trusted."

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