June 2013 LSAT, LR2, Q22, martial arts magazine circulation

Crowdsourcing the June 2013 LSAT:  June 2013 LSAT Explanation Central | About this project Graeme Blake is an LSAT instructor in Montreal. He scored a 177 on the June 2007 LSAT, and has taught for Testmasters and Ivy Global.

The former VP of Curriculum Development at 7Sage LSAT, he's the moderator of Reddit's LSAT forum, and the author of the Hacking The LSAT book series, which offers explanations for LSAT preptests.

You can find his books on amazon, or go to http://lsathacks.com for more information.

This explanation is an excerpt from Graeme's upcoming book of explanations for LSAT 69, which will be available on amazon in the next few days. Graeme thinks LSAT Prep should be a lot less expensive than it is, and thinks that Nathan's project is a great idea.

Guest Blogger: Graeme Blake

QUESTION TYPE: Flawed Reasoning

CONCLUSION: The magazine won't be the largest selling martial arts magazine in ten years.

REASONING: If circulation keeps rising, the magazine will be the best selling martial arts magazine. But circulation won't keep rising.

ANALYSIS: This sounds like a good argument, but really it just incorrectly negates a conditional statement. We have:

Rising fast âžž Best seller

The argument incorrectly assumes:

Rising fast âžž Best seller

It's possible the magazine will be the best selling magazine in ten years even if sales stop rising. Maybe the magazine is already the best seller. Maybe other magazines will see circulation drop.

___________

A.  This is a different error. The author doesn't have to prove that the changes are the only necessary condition. They just have to prove that the changes are a necessary condition. Failing to meet any necessary condition will negate a sufficient condition. B.  The argument doesn't say that slower growth will cause circulation will shrink. The author only says that the magazine will not be a best seller if growth slows. C.  The argument didn't use circular reasoning.They have some evidence for the conclusion: circulation won't increase at the same rate. D.  Actually, a single fact incompatible with a general claim is always enough to prove a general claim false. If I say ”˜all swans are white', then you just need to find one black swan to prove the statement wrong. E. CORRECT. A continued rise in circulation will ensure that the magazine is the best seller. But the rise in circulation may not be necessary. Maybe the magazine is already the best seller. Maybe other magazines' circulation will shrink.

 

Please ask questions and/or suggest corrections to anything that seems confusing... we want to make this the best resource we can for LSAT students. We'll have all the June 2013 explanations up as quickly as possible. Thanks for reading. Tell your friends! --nathan

Crowdsourcing the June 2013 LSAT:  June 2013 LSAT Explanation Central | About this project