LSAT 138 – Section 2 – Question 18

LSAT 138 - Section 2 - Question 18

December 2012

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT138 S2 Q18
+LR
Must be true +MBT
Conditional Reasoning +CondR
Quantifier +Quant
A
2%
152
B
5%
158
C
82%
165
D
2%
154
E
10%
159
141
150
159
 +Medium 147.395 +SubsectionMedium

Every delegate to the convention is a party member. Some delegates to the convention are government officials, and each government official who is at the convention is a speaker at the convention, as well.

Summary
The stimulus can be diagrammed as follows:

Notable Valid Inferences
Some party members are government officials.
Some party members are speakers at the convention.
Some delegates to the convention are speakers at the convention.

A
Every party member at the convention is a delegate to the convention.
Could be false. While we know that every delegate is a party member, we do not know whether every party member is a delegate. There might be more party members than delegates! (A) confuses the necessary and sufficient conditions.
B
At least some speakers at the convention are neither delegates nor party members.
Could be false. We know that some speakers at the convention are delegates and party members, and those speakers could easily constitute the entire lineup! There could also be other speakers, but there don’t have to be.
C
At least some speakers at the convention are delegates to the convention.
Must be true. As shown below, by chaining the conditional claims, we see that there is a “some before all” relationship between “delegate” and “speaker”. This yields the valid conclusion that at least some delegates are speakers and vice versa.
D
All speakers at the convention are government officials.
Could be false. While we know that every government official at the convention is a speaker, we do not know whether every speaker is a government official. There might be more speakers than government officials! (D) confuses the necessary and sufficient conditions.
E
Every government official at the convention is a party member.
Could be false. We know that some government officials at the convention are party members, because all delegates are party members and some delegates are government officials. Yet it’s possible that there are also government officials at the convention who are not party members.

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LSAT PrepTest 138 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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