## PT #55 S. 3. Q 14

Prepare for the LSAT or discuss it with others in this forum.
cloudhidden

Posts: 193
Joined: Sat Dec 31, 2011 9:29 am

### PT #55 S. 3. Q 14

Nat Sherman

Posts: 67
Joined: Thu Aug 16, 2012 9:12 pm

### Re: PT #55 S. 3. Q 14

Lets go with your original example. We have 100 buildings, 90 dwellings and 10 non-dwellings. There are 75 buildings of only limestone and 25 buildings made from more than just limestone. The question says we found a building made of more than just limestone, what is our chance that it is a non-dwelling, which that's easy there's a 10% chance it's a non dwelling. Okay, now lets try to strengthen that with one of the answers.

If we assume (B), that most of the non-dwellings were made from other stone. Since we know most means 51%-100%, lets use 50% since its the minimum. If 50% of the non dwellings are made of multiple materials, we know that 5 are made of multiple materials and 5 are not. So now what is the probability that the random building we found in the original premise is a non-dwelling.

We have 25 multi-stone buildings that we know 5 are non-dwellings. 5/25 = 20%. Since 20% is greater than 10%, (B) strengthens the conclusion that what they are studying is a non-dwelling

Basically in the original question we're given two things that we have dwellings and non-dwellings, and that we have buildings made out of limestone and those made out of other materials. Without the answer choice (B) there is no correlation between the type of stone and the type of dwelling it is, making the fact that they found a multi-stone building and concluding it is a non-dwelling was unwarranted. However, we can strengthen that conclusion by saying that most of the buildings at the site that were non-dwellings, were made of multiple stone.

cloudhidden

Posts: 193
Joined: Sat Dec 31, 2011 9:29 am

### Re: PT #55 S. 3. Q 14

Thank you for the detailed and thought out response. I had been looking for an answer that would raise that probability above 50%, in other words, a sufficient assumption, and not the mere strengthener we needed to just boost that probability however much. I think the mathematical component to some LR questions can cause me to lose sight of the task in the question. But now I'm aware and prepared.

Return to â€œLSAT Prep and Discussion Forumâ€?

### Who is online

Users browsing this forum: No registered users and 6 guests