Logical ReasoningDifficulty: Easy

PT134 S2 Q3 Explanation

Whenever Joe's car is vacuumed

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsParallel

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Stimulus

Whenever Joe's car is vacuumed, the employees of K & L Auto vacuum it; they are the only people who ever vacuum Joe's car. If the employees of K & L Auto vacuumed Joe's car, then Joe took his car to K & L Auto to be fixed. his car to K & L Auto to be fixed.

What this question is testing

Parallel

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
3.

The pattern of reasoning exhibited by the argument above is most similar to that exhibited by which one

Answer choices

  1. Correct85% picked this

    Emily's water glass is wet and it would be wet only if she drank water from it this morning. Since the only time she

    Why this is right

    Emily's water glass is wet. W. It [the water glass] would be W → DTM wet only if she drank water from it this morning. The only time she drinks DTM → TM water in the morning is when she takes her medication. Emily took her medication TM. this morning. The argument triggers the sufficient condition in the first of two if/then relationships that link.

    Skill tested: Parallel · how this choice captures the argument's function is the move to repeat next time.

  2. Wrong Premise1% picked this

    Lisa went to the hair salon today since either she went to the hair salon today or she went to the bank this morning,

    Either she [Lisa] went to the HS or B. hair salon today or she went to the bank this morning. But Lisa did not go to the B. bank this morning. Lisa went to the hair salon HS. today. This argument reasons by ruling out one of two possible options.

  3. Wrong Premise Wrong Validity2% picked this

    There are no bills on John's kitchen table. Since John gets at least one bill per day and he always puts his bills on

    There are no bills on John's BT. kitchen table. John gets at least one bill J → BT per day and he [John] always puts his bills on the kitchen table. Someone else [not John] JCM. must have checked John's mail today. This argument rests on flawed contrapositive reasoning and contains only one if/then premise.

  4. Wrong Conclusion12% picked this

    Linda is grumpy only if she does not have her coffee in the morning, and Linda does not have her coffee in the morning

    Linda is grumpy only if she G → HC does not have her coffee in the morning. Linda does not have her HC → ROC coffee in the morning only if she runs out of coffee. Linda runs out of coffee ROC → G only on days that she is grumpy. First, this argument has an if/then relationship in the conclusion. Second, this argument reverses the logic of what could be concluded.

  5. Wrong Structure1% picked this

    Jeff had to choose either a grapefruit or cereal for breakfast this morning. Given that Jeff is allergic to grapefruit, Jeff must have

    Jeff had to choose either a G or C grapefruit or cereal for breakfast this morning. Jeff is allergic to AG grapefruit. Jeff must have had cereal C for breakfast this morning. This argument reasons by attempting to rule out one of two options before concluding the option that was not ruled out. However, the argument did not completely rule out the possibility that Jeff had grapefruit for breakfast. While he's allergic to grapefruit, that does not ensure that would not choose grapefruit for breakfast.

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