LSAT (Law School Admission Test) · Logical Reasoning
Inference, Flaws and Principles
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 of the firm's accountants hold a CPA license. Some of the firm's employees are not accountants. Every employee who holds a CPA license receives a bonus.
Which one of the following must be true? - Most of the city's restaurants that serve breakfast also serve lunch. No restaurant that serves lunch closes before 2 PM.
Which one of the following must be true? - Every time Marta wears her lucky scarf, her team wins. Marta concludes that wearing the scarf helps her team win.
The reasoning is flawed because it - No one has proven that the old well is safe to drink from. Therefore the old well must be unsafe.
The reasoning is flawed because it - A senator argues that her opponent's tax plan should be rejected, because her opponent was once fined for a parking violation.
The senator's reasoning is flawed because it - Most lawyers at the firm are over forty. Smith is a lawyer at the firm. Therefore Smith is over forty.
The reasoning is flawed because it - Employers should not penalize employees for acting on information the employees reasonably believed to be true.
Which one of the following judgments most closely conforms to the principle above? - Only the species of birds that migrate at night are at risk from the new tower lights. The sandpiper does not migrate at night.
Which one of the following must be true? - The town council says that the new parking fees are needed to repair roads, yet most of the money has been spent elsewhere. The council must either use the fees for road repair, as promised, or abolis…
- Sales fell by 5 percent last year, although the company's marketing budget doubled. So the extra spending on marketing did not help.
In the argument, the statement that sales fell by 5 percent last y… - In a club of 80 students, 60 study Spanish and 50 study French. Every student studies at least one of the two languages.
Which one of the following must be true? - A study of 12 people found no link between a diet and heart disease. The researchers conclude that there is no link at all.
The reasoning is flawed because it - Despite a 20 percent cut in its prices, a shop's revenue rose.
Which one of the following, if true, most helps to resolve the apparent discrepancy? - Many people who take a herbal remedy report fewer colds, yet a controlled study found it no better than a placebo.
Which one of the following, if true, most helps to explain the difference? - A person is responsible for harm only if the harm was foreseeable.
Which one of the following judgments most closely conforms to the principle? - Whenever the alarm sounds, the guards check the doors. The guards did not check the doors on Tuesday.
Which one of the following must be true? - This printer is the most expensive on the market, so it must also be the best.
The reasoning is flawed because it - Some of the novels on the list are mysteries. All the mysteries on the list were written before 1950.
Which one of the following must be true? - Some claim that an ancient city was destroyed by an earthquake. But excavations show that its walls collapsed outward, whereas earthquakes typically make walls fall inward. So the city was not destroy…
- To get the job, you must have a degree. Rosa has a degree. So Rosa will get the job.
The reasoning is flawed because it - Public funds should be spent only on projects that benefit most citizens.
Which one of the following judgments most closely conforms to the principle? - The museum has more paintings than sculptures. It has more sculptures than photographs.
Which one of the following must be true? - The new highway reduced commuting times: average commuting times in the region fell by 6 percent in the year after it opened.
Which one of the following would be most useful to know in evaluating the… - My neighbor's tomato plants grew tall after she used this fertilizer, so the fertilizer must work well for all crops.
The reasoning is flawed because it - Most of the books in the collection are first editions. Most of the books in the collection are signed by the author.
Which one of the following must be true? - Each player on the team is an excellent athlete, so the team must be excellent.
The reasoning is flawed because it