LSAT (Law School Admission Test) · Logical Reasoning
Conditional Logic, Parallel Reasoning and Resolving Discrepancies
26 practice questions, each with the answer and an explanation.
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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.
All 26 questions
- All the tickets in the box are winners. This ticket is in the box. So this ticket is a winner.
Which one of the following arguments is most similar in its reasoning to the argument above? - Most dogs in the park are friendly. Rex is in the park. So Rex is friendly.
Which one of the following arguments is most similar in its flawed reasoning to the argument above? - If the budget is approved, the library will extend its hours. The library did not extend its hours.
Which one of the following must be true? - If it rains, the match is cancelled. If the match is cancelled, the tickets are refunded.
Which one of the following must be true? - Only employees with badges may enter the lab. Lena may enter the lab.
Which one of the following must be true? - If the engine is overheating, the warning light comes on. The warning light is on. So the engine is overheating.
The reasoning is flawed because it - The town has twice as many doctors as it did a decade ago, yet patients wait longer for appointments.
Which one of the following, if true, most helps to resolve the discrepancy? - A new battery lasts twice as long as the old one, yet customers report that their devices run out of power sooner.
Which one of the following, if true, most helps to resolve the discrepancy? - Dr. Kim claims that a new method teaches reading faster. After a term, pupils taught by the new method read more words per minute than pupils taught by the standard method.
Which one of the following… - Dr. Kim claims that a new method teaches reading faster. After a term, pupils taught by the new method read more words per minute than pupils taught by the standard method.
Which one of the following… - Some people complain that the museum's new wing, which is mostly empty, was a waste of money. But new wings are built for future collections, and the museum expects major donations next year. Therefor…
- Some people complain that the museum's new wing, which is mostly empty, was a waste of money. But new wings are built for future collections, and the museum expects major donations next year. Therefor…
- Every novel that Joyce read this year was either a mystery or a romance. She read no mysteries in March.
Which one of the following must be true? - At a conference, half of the speakers are scientists and a third are engineers. The rest are artists, and no speaker belongs to more than one group. There are 60 speakers.
How many of the speakers ar… - The new medicine must be safe, because it has been used for years in other countries.
Which one of the following is an assumption on which the argument depends? - Either we raise taxes or the schools will close. We do not want taxes raised. So the schools will close.
The reasoning is flawed because it - This restaurant must be popular, because so many people eat here.
The reasoning is flawed because it - A promise made under threat is not binding.
Which one of the following judgments most closely conforms to the principle? - Dara: Computers will never write good novels, since none has ever done so.
Evan: By that reasoning, nobody could have predicted the airplane before 1903.
Evan responds to Dara by - Some of the committee members are lawyers. All lawyers are required to take the ethics course.
Which one of the following must be true? - An economist argues that the coming minimum wage increase will not cut jobs, because earlier increases did not.
Which one of the following, if true, most strengthens the economist's argument? - A shopping center manager argues that free parking raised sales, because sales rose by 15 percent after it was introduced.
Which one of the following, if true, most seriously weakens the manager's ar… - A car maker advertises that its car gets 50 miles per gallon.
Which one of the following would be most useful in evaluating the claim? - The average of five test scores is 80. The lowest score is 60.
Which one of the following must be true? - Teachers should grade only what they have taught.
Which one of the following judgments most closely conforms to the principle? - No tool in the kit is made of plastic. The wrench is in the kit. So the wrench is not made of plastic.
Which one of the following arguments is most similar in its reasoning?