PT26.S2.Q20 - martha's friend, who is very knowledgeable about edible flowers

kclubs323kclubs323 Alum Member Inactive ⭐
edited December 2015 in Logical Reasoning 275 karma
http://7sage.com/lsat_explanations/lsat-26-section-2-question-20/
Can anyone explain this question to me? If you could first point out and explain what the flaw in the stimulus is and then match that against the correct answer, I would greatly appreciate it.

Comments

  • SoCal JaporeanSoCal Japorean Free Trial Member
    edited August 2014 147 karma
    I'll take a whack at it KOC.The core of the stimulus is like this:

    Daisies --> Chrysanthemum "Some" Edible

    Therefore Daises "Some" Edible

    This cannot be inferred. This is a very common LSAT conditional logic error.

    The flaw is that you are trying to infer something that isn't inferrable.

    There is an answer Choice that matches this error structure almost perfectly.

    Noriko's Sisters "Some" Debate Team "Some" Poor Student

    Therefore Noriko's Sisters "Some" Poor Student

    I hope that answers your question. I can go over the wrong answer choices if you want or answer any question that you might have if you have any further questions.
  • kclubs323kclubs323 Alum Member Inactive ⭐
    275 karma
    SCJ,

    Thanks for the explanation! It actually helped me understand.
    If you don't mind, would you be able to explain why the other answer choices are incorrect?
  • SoCal JaporeanSoCal Japorean Free Trial Member
    147 karma
    Okie Dokie.

    A) Jeanne --> City chorus --> Renowned

    Therefore Jeanne --> Excellent singer

    The Structure of the argument is valid. This flaw (if any) would be requiring Renowned to mean being Excellent Singer (Scope Shift)


    B) Rolfe --> Library Reading Group --> Avid Reader

    Therefore Rolfe --> Avid Reader

    Valid Argument.


    D) Leon's Friends --M-> Good Swimmers --> Quite Strong

    Therefore Leon's Friends "Some" Quite Strong

    Valid Argument. You could even say Leon's Friends --M-> Quite Strong


    E) Teresa's Collegues "Some" Written Books --M-> On (About) Good Writing

    Therefore Teresa's Colleagues "Some" Good Writers

    Invalid Structure, you can never get a deductive inference in a syllogism using terms that combine a "Most" with a "Some"

    Invalid Inferences. If I had to guess, I would guess that the flaw would be requiring people who write about Good Writing to in reality be Good Writers.

    Hope this clarifies your understanding of the question KOC.

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