LSAT - Law School Admission Principle and Parallel Reasoning Questions and Answers — Questions and Answers
Question 1: A city ordinance states that it is illegal to operate a food truck within 500 feet of any brick-and-mortar restaurant. The reasoning is to prevent unfair competition for established businesses that pay property taxes. A new gourmet ice cream truck is fined for operating 400 feet from a pizzeria. Which of the following principles would most strongly justify the city's action?
- Mobile businesses should not be subject to the same regulations as businesses with fixed locations.
- All businesses, regardless of their specific product, that sell food are considered competitors under the law. (Correct answer)
- Pizzerias and ice cream trucks do not sell competing products, so the ordinance should not apply.
- The primary purpose of city ordinances is to generate revenue through fines.
Correct answer: All businesses, regardless of their specific product, that sell food are considered competitors under the law.
The core of the issue is whether an ice cream truck is a 'competitor' to a pizzeria in the eyes of the ordinance. The principle in answer B provides the necessary link: if all businesses selling food are considered competitors, then the ordinance justifiably applies to the ice cream truck, regardless of the difference in their primary offerings. This principle directly supports the city's application of the rule.
Question 2: Argument: 'Every time I've eaten at The Golden Spoon, the service has been excellent. Therefore, the next time I eat there, the service will be excellent.' The pattern of reasoning in the argument above is most similar to which of the following?
- All swans I have ever seen are white. Therefore, all swans must be white.
- The sun has risen every day in recorded history. Therefore, the sun will rise tomorrow.
- This stock has decreased in value for the past three days. Therefore, it will continue to decrease tomorrow. (Correct answer)
- My new car has a five-star safety rating, so it is guaranteed to be safe in any accident.
Correct answer: This stock has decreased in value for the past three days. Therefore, it will continue to decrease tomorrow.
The original argument makes a prediction about a single future event based on a consistent pattern of past experiences (inductive reasoning). Answer C mirrors this structure perfectly: a pattern of a stock decreasing for a few days is used to predict the same outcome for the next single instance (tomorrow). Answer A makes a universal claim ('all swans'), not a prediction about a single next event. Answer B is similar but relies on an extremely large and reliable dataset, making the inference much stronger than the original. Answer D relies on a rating or guarantee, not a pattern of personal observation.
Question 3: Principle: A person is morally obligated to fulfill a promise only if the promise was not made under duress. Which of the following situations best conforms to this principle?
- David promised to pay for a broken window after his neighbor threatened to sue him. David is not morally obligated to pay. (Correct answer)
- Maria promised her friend she would help her move, and she did. Therefore, Maria was morally obligated to help.
- A company promises a bonus to employees who meet a sales target. An employee who meets the target is morally entitled to the bonus.
- James promised to keep a secret but revealed it when he realized it involved a crime. He was not morally obligated to keep the secret.
Correct answer: David promised to pay for a broken window after his neighbor threatened to sue him. David is not morally obligated to pay.
This answer directly applies the principle. The threat of a lawsuit constitutes duress. According to the principle, a promise made under duress does not create a moral obligation. Therefore, David is not morally obligated to pay, which perfectly aligns with the stated principle. The other options introduce different ethical considerations not covered by the specific principle.
Question 4: A law professor states: 'To be a successful lawyer, one must be both diligent and articulate. Julia is very diligent, but she is not articulate. Therefore, Julia will not be a successful lawyer.' Which of the following arguments has a logical structure that is most parallel to the professor's argument?
- To bake a good cake, you need flour and sugar. This recipe uses flour, but not sugar. Therefore, this recipe will not produce a good cake. (Correct answer)
- To win the game, the team must have a strong offense or a strong defense. The team has a strong offense, so they will win the game.
- Anyone who is a doctor must have gone to medical school. Robert is a doctor, so he must have gone to medical school.
- If you study hard, you will pass the exam. You did not study hard, so you will not pass the exam.
Correct answer: To bake a good cake, you need flour and sugar. This recipe uses flour, but not sugar. Therefore, this recipe will not produce a good cake.
The original argument's structure is: To achieve X, one needs A AND B. Person P has A, but not B. Therefore, Person P will not achieve X. Answer A perfectly mirrors this structure: To achieve a good cake (X), you need flour (A) AND sugar (B). This recipe has flour (A), but not sugar (B). Therefore, this recipe will not produce a good cake (X). The other options represent different logical forms, such as 'or' conditions, affirming the antecedent, and denying the antecedent.
Question 5: A company policy states that employees who have been with the company for over ten years are entitled to an additional week of vacation. Mark has been with the company for twelve years but was denied the extra week because he recently switched from a part-time to a full-time role. The company's action is based on a principle that could be stated as which of the following?
- Only full-time employment counts toward the ten-year service requirement. (Correct answer)
- All employees with over ten years of service deserve extra vacation.
- Changing employment status resets an employee's years of service.
- Company policies can be changed at any time without notice.
Correct answer: Only full-time employment counts toward the ten-year service requirement.
The company acknowledges Mark's 12 years of association but denies the benefit. The most direct justification for this is an underlying principle that not all of his 12 years are 'qualifying' years. The principle that only full-time employment counts would explain why his recent switch is relevant and why his tenure, despite its length, doesn't meet the requirement for the benefit. The other answers are either contradicted by the scenario or introduce irrelevant ideas.
Question 6: Argument: 'All successful startup founders are risk-takers. All risk-takers are optimistic. Therefore, all successful startup founders are optimistic.' The reasoning in which of the following arguments is most similar?
- All cars have wheels. All wheels are round. Therefore, all cars have something that is round.
- All dogs are mammals. All mammals are animals. Therefore, all dogs are animals. (Correct answer)
- Some politicians are lawyers. Some lawyers are honest. Therefore, some politicians are honest.
- All birds can fly. A penguin is a bird. Therefore, a penguin can fly.
Correct answer: All dogs are mammals. All mammals are animals. Therefore, all dogs are animals.
This is a classic example of a transitive property in logic, or a categorical syllogism. The structure is: All A are B. All B are C. Therefore, all A are C. Answer B perfectly replicates this structure: All dogs (A) are mammals (B). All mammals (B) are animals (C). Therefore, all dogs (A) are animals (C). Answer A is slightly different in its conclusion. Answer C uses 'some' instead of 'all', which is a different logical structure (and is invalid). Answer D applies a general rule to a specific instance, which is also a different pattern of reasoning.
LSAT - Law School Admission Principle and Parallel Reasoning Questions and Answers
A city ordinance states that it is illegal to operate a food truck within 500 feet of any brick-and-mortar restaurant.
The reasoning is to prevent unfair competition for established businesses that pay property taxes.
A new gourmet ice cream truck is fined for operating 400 feet from a pizzeria.
Which of the following principles would most strongly justify the city's action?