Princeton Review "Cracking the LSAT 2012" Game #5

tjstefono
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Joined: Mon Sep 12, 2011 4:17 pm

Princeton Review "Cracking the LSAT 2012" Game #5

Postby tjstefono » Wed Nov 09, 2011 11:28 am

Okay, I have a quick question. I seem to be missing something from what I read TLS's article "A lesson in Conditional Reasoning," and what The Princeton Review game seems to be indicating. If I understood the article correctly, the antecedent always follows the if statement, and thus comes first in the symbolization of the conditional statement.

Example: If A is displayed, then neither B nor L can be displayed. A------> ~B and ~L

In game #5 (pg. 187) in 2012 PR LSAT, the 2nd conditional statement is, "B is displayed only if D is displayed." Which, if I understanding the article on here should be symbolized as follows: D---->B.

However, on the game walk through, it displays this statement oppositely, B-----> D.

I think I am clearly misunderstanding something here. Can somebody help me understand what I am missing?

Thanks

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Re: Princeton Review "Cracking the LSAT 2012" Game #5

Postby LSAT Blog » Wed Nov 09, 2011 11:36 am

"Only if" is a necessary condition indicator.

As such, "B only if D" means:

B ---> D

The book is correct.

***

Take this statement: "I'll date her only if she's a model."

This means, if I date her, then she must be a model.

Date -> Model

This doesn't mean: if she's a model, then I date her.

There are thousands upon thousands of models. I just don't have the time to date that many girls at once.

tjstefono
Posts: 7
Joined: Mon Sep 12, 2011 4:17 pm

Re: Princeton Review "Cracking the LSAT 2012" Game #5

Postby tjstefono » Wed Nov 09, 2011 11:42 am

Thanks, and I assumed the book was correct. I just couldn't see what I was missing.

Thanks!




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