LSAT 2026 Exam Prep Comprehensive Study Guide
with 100 Practice Questions, Detailed Explanations,
and Verified Answers
SECTION 1: LOGICAL REASONING (60 Questions)
Question 1
Stimulus: "All mammals are warm-blooded. All dogs are mammals. Therefore, all
dogs are warm-blooded."
The reasoning in the argument above is best described as:
A) Circular reasoning
B) Deductive reasoning
C) Inductive reasoning
D) Analogical reasoning
Answer: B
Rationale: This is a classic example of deductive reasoning — a logical process
where a conclusion follows necessarily from the premises. The argument moves
from general premises (all mammals are warm-blooded, all dogs are mammals) to
a specific conclusion (all dogs are warm-blooded) with certainty. Circular
reasoning (Option A) occurs when the conclusion is assumed in the premises.
Inductive reasoning (Option C) involves probabilistic conclusions. Analogical
reasoning (Option D) compares two similar cases.
Question 2
Stimulus: "The city council should not approve the new shopping mall. The
developers have a history of environmental violations, and the mall would increase
traffic congestion in the surrounding neighborhoods."
Which of the following, if true, would MOST weaken the argument?
,A) The developers have recently implemented new environmental policies
B) The city council typically approves all commercial development projects
C) Traffic congestion has decreased in the city over the past five years
D) The surrounding neighborhoods have requested more shopping options
Answer: A
Rationale: This is a Weaken question. The argument concludes that the mall
should not be approved based on two premises: (1) developers have a history of
environmental violations, and (2) the mall would increase traffic congestion.
Option A weakens the argument by undermining the first premise — if the
developers have implemented new environmental policies, their past violations
may be less relevant. Option B does not address the premises. Option C is
irrelevant to the specific claim about the mall's impact. Option D, while potentially
strengthening the argument for the mall, does not directly weaken the stated
reasons against approval.
Question 3
Stimulus: "Some critics argue that advertising unhealthy snack foods during
children's television programming encourages poor eating habits. In response, the
Snack Foods Association argues that parents are ultimately responsible for their
children's dietary choices."
The reasoning in the Snack Foods Association's response is flawed because it:
A) Fails to consider that parents may also buy unhealthy snacks due to advertising
B) Confuses correlation with causation
C) Assumes that all parents have the same level of nutritional knowledge
D) Shifts the focus from the effect of advertising to parental responsibility
Answer: D
Rationale: This is a Flaw in Reasoning question. The Snack Foods Association's
response is flawed because it shifts the focus from the issue of whether advertising
influences children's eating habits to the separate issue of parental responsibility.
The fact that parents are ultimately responsible does not negate the possibility that
advertising may still encourage poor eating habits. Option A is not directly
addressed. Option B would apply if the argument confused correlation with
,causation, which it does not. Option C introduces an assumption not present in the
argument.
Question 4
Stimulus: "If a student studies for at least 10 hours per week, then the student will
pass the exam. Maria passed the exam. Therefore, Maria must have studied for at
least 10 hours per week."
The reasoning above is an example of:
A) Modus ponens
B) Modus tollens
C) Affirming the consequent
D) Denying the antecedent
Answer: C
Rationale: This is a Flaw in Reasoning question. The argument commits the
logical fallacy of affirming the consequent. The conditional statement is: If P
(studies ≥10 hours) → then Q (passes exam). The argument states Q is true (Maria
passed) and concludes P is true (Maria studied ≥10 hours). This is invalid because
there could be other reasons Maria passed. Modus ponens (Option A) would be: If
P, then Q; P; therefore Q. Modus tollens (Option B) would be: If P, then Q; not Q;
therefore not P. Denying the antecedent (Option D) would be: If P, then Q; not P;
therefore not Q.
Question 5
Stimulus: "The new drug reduces symptoms in 80% of patients. Therefore, the
drug is effective."
Which of the following is an assumption required by the argument?
A) The drug has no side effects
B) The patients in the study are representative of the general population
C) The drug is affordable for most patients
D) The drug was tested on animals before human trials
Answer: B
, Rationale: This is an Assumption question. The argument concludes that the drug
is effective based on the premise that it reduces symptoms in 80% of patients. For
this conclusion to be valid, the argument must assume that the patients in the study
are representative of the general population (or the population the drug is
intended for). If the patients were not representative, the 80% success rate might
not apply to the broader population. Option A is not required — effectiveness does
not depend on the absence of side effects. Option C is irrelevant to effectiveness.
Option D is about the testing process, not effectiveness.
Question 6
Stimulus: "The northern cardinal, a nonmigratory songbird, has been seen more
frequently in Nova Scotia in recent years. Since the region has experienced warmer
winters during this same period, the increase in cardinal sightings is likely due to
climate change."
Which of the following, if true, MOST weakens the argument?
A) Northern cardinals are known to be attracted to urban areas with bird feeders
B) The population of northern cardinals has increased throughout North America
C) The warmer winters in Nova Scotia are part of a natural climate cycle
D) Northern cardinals are not native to Nova Scotia
Answer: A
Rationale: This is a Weaken question. The argument concludes that warmer
winters (climate change) caused the increase in cardinal sightings. Option A
weakens this by providing an alternative explanation — the cardinals may be
attracted to urban areas with bird feeders rather than responding to climate change.
Option B does not weaken the argument; it could even strengthen it. Option C does
not weaken the argument because natural climate cycles are still a form of climate
change. Option D is irrelevant to the cause of the increase.
Question 7
Stimulus: "Each new car in the lot at Rollway Motors costs more than each used
car in the lot. However, some cars in the lot cost less than $15,000."
If the statements above are true, which of the following must also be true?
with 100 Practice Questions, Detailed Explanations,
and Verified Answers
SECTION 1: LOGICAL REASONING (60 Questions)
Question 1
Stimulus: "All mammals are warm-blooded. All dogs are mammals. Therefore, all
dogs are warm-blooded."
The reasoning in the argument above is best described as:
A) Circular reasoning
B) Deductive reasoning
C) Inductive reasoning
D) Analogical reasoning
Answer: B
Rationale: This is a classic example of deductive reasoning — a logical process
where a conclusion follows necessarily from the premises. The argument moves
from general premises (all mammals are warm-blooded, all dogs are mammals) to
a specific conclusion (all dogs are warm-blooded) with certainty. Circular
reasoning (Option A) occurs when the conclusion is assumed in the premises.
Inductive reasoning (Option C) involves probabilistic conclusions. Analogical
reasoning (Option D) compares two similar cases.
Question 2
Stimulus: "The city council should not approve the new shopping mall. The
developers have a history of environmental violations, and the mall would increase
traffic congestion in the surrounding neighborhoods."
Which of the following, if true, would MOST weaken the argument?
,A) The developers have recently implemented new environmental policies
B) The city council typically approves all commercial development projects
C) Traffic congestion has decreased in the city over the past five years
D) The surrounding neighborhoods have requested more shopping options
Answer: A
Rationale: This is a Weaken question. The argument concludes that the mall
should not be approved based on two premises: (1) developers have a history of
environmental violations, and (2) the mall would increase traffic congestion.
Option A weakens the argument by undermining the first premise — if the
developers have implemented new environmental policies, their past violations
may be less relevant. Option B does not address the premises. Option C is
irrelevant to the specific claim about the mall's impact. Option D, while potentially
strengthening the argument for the mall, does not directly weaken the stated
reasons against approval.
Question 3
Stimulus: "Some critics argue that advertising unhealthy snack foods during
children's television programming encourages poor eating habits. In response, the
Snack Foods Association argues that parents are ultimately responsible for their
children's dietary choices."
The reasoning in the Snack Foods Association's response is flawed because it:
A) Fails to consider that parents may also buy unhealthy snacks due to advertising
B) Confuses correlation with causation
C) Assumes that all parents have the same level of nutritional knowledge
D) Shifts the focus from the effect of advertising to parental responsibility
Answer: D
Rationale: This is a Flaw in Reasoning question. The Snack Foods Association's
response is flawed because it shifts the focus from the issue of whether advertising
influences children's eating habits to the separate issue of parental responsibility.
The fact that parents are ultimately responsible does not negate the possibility that
advertising may still encourage poor eating habits. Option A is not directly
addressed. Option B would apply if the argument confused correlation with
,causation, which it does not. Option C introduces an assumption not present in the
argument.
Question 4
Stimulus: "If a student studies for at least 10 hours per week, then the student will
pass the exam. Maria passed the exam. Therefore, Maria must have studied for at
least 10 hours per week."
The reasoning above is an example of:
A) Modus ponens
B) Modus tollens
C) Affirming the consequent
D) Denying the antecedent
Answer: C
Rationale: This is a Flaw in Reasoning question. The argument commits the
logical fallacy of affirming the consequent. The conditional statement is: If P
(studies ≥10 hours) → then Q (passes exam). The argument states Q is true (Maria
passed) and concludes P is true (Maria studied ≥10 hours). This is invalid because
there could be other reasons Maria passed. Modus ponens (Option A) would be: If
P, then Q; P; therefore Q. Modus tollens (Option B) would be: If P, then Q; not Q;
therefore not P. Denying the antecedent (Option D) would be: If P, then Q; not P;
therefore not Q.
Question 5
Stimulus: "The new drug reduces symptoms in 80% of patients. Therefore, the
drug is effective."
Which of the following is an assumption required by the argument?
A) The drug has no side effects
B) The patients in the study are representative of the general population
C) The drug is affordable for most patients
D) The drug was tested on animals before human trials
Answer: B
, Rationale: This is an Assumption question. The argument concludes that the drug
is effective based on the premise that it reduces symptoms in 80% of patients. For
this conclusion to be valid, the argument must assume that the patients in the study
are representative of the general population (or the population the drug is
intended for). If the patients were not representative, the 80% success rate might
not apply to the broader population. Option A is not required — effectiveness does
not depend on the absence of side effects. Option C is irrelevant to effectiveness.
Option D is about the testing process, not effectiveness.
Question 6
Stimulus: "The northern cardinal, a nonmigratory songbird, has been seen more
frequently in Nova Scotia in recent years. Since the region has experienced warmer
winters during this same period, the increase in cardinal sightings is likely due to
climate change."
Which of the following, if true, MOST weakens the argument?
A) Northern cardinals are known to be attracted to urban areas with bird feeders
B) The population of northern cardinals has increased throughout North America
C) The warmer winters in Nova Scotia are part of a natural climate cycle
D) Northern cardinals are not native to Nova Scotia
Answer: A
Rationale: This is a Weaken question. The argument concludes that warmer
winters (climate change) caused the increase in cardinal sightings. Option A
weakens this by providing an alternative explanation — the cardinals may be
attracted to urban areas with bird feeders rather than responding to climate change.
Option B does not weaken the argument; it could even strengthen it. Option C does
not weaken the argument because natural climate cycles are still a form of climate
change. Option D is irrelevant to the cause of the increase.
Question 7
Stimulus: "Each new car in the lot at Rollway Motors costs more than each used
car in the lot. However, some cars in the lot cost less than $15,000."
If the statements above are true, which of the following must also be true?
