Logical ReasoningDifficulty: Easy

PT106 S2 Q15 Explanation

Rhonda will see the movie tomorrow

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

TopicsParallel

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Stimulus

Rhonda will see the movie tomorrow afternoon only if Paul goes to the concert in the afternoon. Paul will not go to the concert unless Ted agrees to go to the concert. However, Ted refuses to will not see the movie tomorrow afternoon.

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
15.

The pattern of reasoning displayed above is most closely paralleled in which one

Answer choices

  1. Bad Premise Match: no chain3% picked this

    If Janice comes to visit, Mary will not pay the bills tomorrow. Janice will not come to visit unless she locates a babysitter. However,

    These two conditional premises don't form a chain. They start from the same trigger: J visits → ~Mary pays J visits → J finds babysitter

  2. Correct83% picked this

    Gary will do his laundry tomorrow only if Peter has to go to work. Unless Cathy is ill, Peter will not have to go

    Why this is right

    We need two premises that chain together A → B B → C G laundry → P work P work → C ill Then we need a premise saying "not C" C is not ill and a conclusion saying "not A" G not laundry The hardest part of this answer is dealing with the second conditional. We know that "unless" means "If-not" and that you can do the "if-not" to either idea in the sentence. So we can choose to write it as If Cathy is not ill, Peter will not have to work. or write is as If Peter will not not have to work, Cathy is ill. The double negative gives us, If Peter will have to work, Cathy is ill.

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

  3. Bad Premise Match: only 1 conditional3% picked this

    Kelly will barbecue fish tonight if it does not rain and the market has fresh trout. Although the forecast does not call for rain,

    This argument only has that one conditional in the first sentence, so we're not going to get the two conditionals chaining together that we had in the original.

  4. Bad Premise Match: only 1 conditional4% picked this

    Lisa will attend the family reunion next week only if one of her brothers, Jared or Karl, also attends. Karl will not attend the

    This argument only has that one conditional in the first sentence, so we're not going to get the two conditionals chaining together that we had in the original.

  5. Bad Premise/Conclusion Match6% picked this

    George will not go to the museum tomorrow unless Mark agrees to go. Mark will go to the museum only if he can postpone

    This argument does have two conditional premises that chain together: G museum → M museum M museum → postpone most The next two ingredients we would need to hear are, "But Mark will not postpone most of his appointments. So George will not go to the museum." However, the premise says Mark postponed some of his appointments, and the conclusion says Mark will not go to the museum.

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