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Logical Reasoning Help Needed

Posted: Thu Jul 01, 2010 2:16 pm
by washin34
Test 36 section 1 question 21. I am having a terrible time with these type problems. (parallel reasoning) How is it possible that "A" is the correct answer? Please help me. If you have ANY strategy for these types of problems, that would help me as well. Thanks!

Re: Logical Reasoning Help Needed

Posted: Thu Jul 01, 2010 2:29 pm
by unattended bag
I haven't read the question, but a general strategy for parallel reasoning is to first look at the conclusion. For example, If the conclusion is "something does not happen", then rule out every answer choice where the conclusion is that something does happen. You should be able to eliminate at least 2-3 answers by doing this. After that, if the correct answer doesn't jump out at you, look at the evidence that supports the conclusion in the stimulus (premises). The correct answer should have premises that are structured in the same way.

Re: Logical Reasoning Help Needed

Posted: Thu Jul 01, 2010 2:31 pm
by Atlas LSAT Teacher
For these questions, your first job is to identify the flaw. Don't worry about the content, look for the underlying issue. Here, the argument is flaws in that it's not true that if a portrait is not accurate, that one cannot make a good reproduction of that painting. One could make a perfect replica of that flawed painting.

(A) has that same flaw - just because the original was flawed, doesn't mean that a reproduction of it has to be of bad quality.

Does that make sense?

Re: Logical Reasoning Help Needed

Posted: Thu Jul 01, 2010 2:32 pm
by Atlas LSAT Teacher

Re: Logical Reasoning Help Needed

Posted: Thu Jul 01, 2010 2:35 pm
by Audio Technica Guy
unattended bag wrote:I haven't read the question, but a general strategy for parallel reasoning is to first look at the conclusion. For example, If the conclusion is "something does not happen", then rule out every answer choice where the conclusion is that something does happen. You should be able to eliminate at least 2-3 answers by doing this.
This doesn't always work. Occasionally the correct answer is a perfect mirror image. For example, if the original argument was essentially:

Premise: ~A --> B
Premise: ~B
Conclusion: A

The correct answer could work like:

Premise: C --> ~D
Premise: D
Conclusion: ~C

Re: Logical Reasoning Help Needed

Posted: Thu Jul 01, 2010 2:37 pm
by Audio Technica Guy
Your biggest issue is that this isn't a parallel question, its a parallel flaw question. The structure can match, but doesn't have to. Mostly you have to identify the flaw in your own words and then with the answer choices ask yourself "does this have X flaw?"

This Q type mostly comes down to accurately being able to find flaws. In fact it's the only question type that you actually MUST find the flaw. (you actually don't have to find the flaw to correctly answer a flaw question, oddly enough).

Re: Logical Reasoning Help Needed

Posted: Thu Jul 01, 2010 3:27 pm
by washin34
Thanks guys. It makes perfect sense now.