LSAT 155 – Section 4 – Question 20
LSAT 155 - Section 4 - Question 20
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Question QuickView |
Type | Tags | Answer Choices |
Curve | Question Difficulty |
Psg/Game/S Difficulty |
Explanation |
---|---|---|---|---|---|---|---|
PT155 S4 Q20 |
+LR
| Flaw or descriptive weakening +Flaw Conditional Reasoning +CondR | A
70%
162
B
8%
150
C
2%
151
D
3%
150
E
17%
156
|
145 152 160 |
+Medium | 147.589 +SubsectionMedium |
Summarize Argument
The author concludes that a highly literate society will be a democratic one. This is based on the following facts:
Democracy requires free choices.
Free choices require well-reasononed opinions.
Well-reasoning opinions require reading skills.
Identify and Describe Flaw
The author confuses necessary conditions for sufficient conditions. Reading skills are necessary for well-reasoned opinions. But that doesn’t imply reading skills are enough for well-reasoned opinions. In addition, well-reasoned opinions are necessary for free choices, but that doesn’t imply they are sufficient for such choices. And free choices are necessary for democracy, but that doesn’t imply they are sufficient for democracy.
A
mistakes necessary conditions for sufficient conditions
The author confuses all of the necessary conditions described for sufficient conditions. This is why the author thinks a highly literate society (one with lots of reading skills) will be a democratic one.
B
fails to take into account that there are many means of forming well-reasoned opinions
Whether there are many ways to form well-reasoned opinion has no impact on the argument. We know reading skills are necessary for well-formed opinions. The author mistakenly believes having reading skills is sufficient for such opinions.
C
confuses the means of doing something with the reasons for doing it
The “reasons” for doing something — meaning, the motivations for doing something — are irrelevant. The flaw concerns a confusion of necessary and sufficient conditions. Why people take certain actions has no impact on the reasoning.
D
generalizes too hastily from one type of case to another
There’s no generalization. The author’s conclusion concerns the Information Age, and the premises also concern the Information Age.
E
takes for granted that a condition under which something occurs is a condition under which all its prerequisites occur
(E) doesn’t describe flawed logic. If X is a condition under which Y occurs, then X is also a condition under which prerequisites for Y occur (because prerequisites are necessary). In other words, if X implies Y, then it also implies everything necessary for Y.
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LSAT PrepTest 155 Explanations
Section 1 - Logical Reasoning
- Question 01
- Question 02
- Question 03
- Question 04
- Question 05
- Question 06
- Question 07
- Question 08
- Question 09
- Question 10
- Question 11
- Question 12
- Question 13
- Question 14
- Question 15
- Question 16
- Question 17
- Question 18
- Question 19
- Question 20
- Question 21
- Question 22
- Question 23
- Question 24
- Question 25
Section 2 - Logical Reasoning
- Question 01
- Question 02
- Question 03
- Question 04
- Question 05
- Question 06
- Question 07
- Question 08
- Question 09
- Question 10
- Question 11
- Question 12
- Question 13
- Question 14
- Question 15
- Question 16
- Question 17
- Question 18
- Question 19
- Question 20
- Question 21
- Question 22
- Question 23
- Question 24
- Question 25
- Question 26
Section 3 - Reading Comprehension
- Passage 1 – Passage
- Passage 1 – Questions
- Passage 2 – Passage
- Passage 2 – Questions
- Passage 3 – Passage
- Passage 3 – Questions
- Passage 4 – Passage
- Passage 4 – Questions
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