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

kclubs323

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.

SoCal Japorean

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.

kclubs323

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 Japorean

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)


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.