LSAT 132 – Section 2 – Question 19

LSAT 132 - Section 2 - Question 19

December 2010

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT132 S2 Q19
+LR
Must be true +MBT
Conditional Reasoning +CondR
Quantifier +Quant
Kick It Up +KIU
A
3%
157
B
15%
157
C
9%
159
D
63%
166
E
9%
161
146
157
168
 +Harder 148.345 +SubsectionMedium

In West Calverton, most pet stores sell exotic birds, and most of those that sell exotic birds also sell tropical fish. However, any pet store there that sells tropical fish but not exotic birds does sell gerbils; and no independently owned pet stores in West Calverton sell gerbils.

Summary

The stimulus can be diagrammed as follows:

Notable Valid Inferences

No West Calverton pet store that sells tropical fish but not exotic birds is independently owned.

All independently owned West Calverton pet stores either sell exotic birds or don’t sell tropical fish.

A
Most pet stores in West Calverton that are not independently owned do not sell exotic birds.

Could be false. The stimulus never has “pet stores in West Calverton that are not independently owned” as a sufficient condition, so we can’t make any valid inferences about the percentage of those stores that do or don’t sell exotic birds.

B
No pet stores in West Calverton that sell tropical fish and exotic birds sell gerbils.

Could be false. As shown below, answer choice (B) is a conditional statement that uses “tropical fish and exotic birds” as its sufficient condition. But the stimulus doesn’t say anything about pet stores that sell tropical fish and exotic birds!

C
Some pet stores in West Calverton that sell gerbils also sell exotic birds.

Could be false. All we know about pet stores in West Calverton that sell gerbils is that they’re not independently owned. We have no information about whether or not some might also sell exotic birds!

D
No independently owned pet store in West Calverton sells tropical fish but not exotic birds.

Must be true. As shown below, by chaining the conditional claims, we see that “not selling tropical fish or selling exotic birds” is a necessary condition of being an independently owned pet store in West Calverton.

E
Any independently owned pet store in West Calverton that does not sell tropical fish sells exotic birds.

Could be false. Any independently owned pet store in West Calverton must either not sell tropical fish or sell exotic birds, but that means these stores could do any of the following: not sell tropical fish, sell exotic birds, or both sell exotic birds AND not sell tropical fish.

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Review Results

LSAT PrepTest 132 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Reading Comprehension

Section 4 - Logical Reasoning

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