LSAT 149 – Section 1 – Question 18

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Type Tags Answer
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Curve Question
Difficulty
Psg/Game/S
Difficulty
Explanation
PT149 S1 Q18
+LR
Must be true +MBT
Conditional Reasoning +CondR
A
6%
157
B
2%
156
C
29%
158
D
6%
157
E
57%
166
153
160
168
+Hardest 143.093 +SubsectionEasier

If the standards committee has a quorum, then the general assembly will begin at 6:00 P.M. today. If the awards committee has a quorum, then the general assembly will begin at 7:00 P.M. today.

Summary
The stimulus can be diagrammed as follows:

Notable Valid Inferences
The standards committee and the awards committee cannot both have a quorum.

A
If the general assembly does not begin at 6:00 P.M. today, then the awards committee has a quorum.
This could be false. If the general assembly does not begin at 6:00 PM, we know that the standards committee doesn’t have a quorum, but it could be the case that the awards committee doesn’t have a quorum either.
B
If the standards committee does not have a quorum, then the awards committee has a quorum.
This could be false. It is possible for neither committee to have a quorum.
C
If the general assembly begins at 6:00 P.M. today, then the standards committee has a quorum.
This could be false. We know that if the standards committee has a quorum, then the general assembly will begin at 6:00 PM. (C) reverses the sufficient and necessary conditions.
D
If the general assembly does not begin at 7:00 P.M. today, then the standards committee has a quorum.
This could be false. If the general assembly does not begin at 7:00 PM, we know that the awards committee doesn’t have a quorum, but it could be the case that the standards committee doesn’t have a quorum either.
E
If the standards committee has a quorum, then the awards committee does not have a quorum.
This must be true. As shown below, by chaining the conditional claims, we see that if the standards committee has a quorum, then the awards committee does not have a quorum.

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