Logical ReasoningDifficulty: Hard

PT119 S4 Q8 Explanation

Some students attending a small

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

TopicsSufficient Assumption

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Some students attending a small university with a well-known choir live off campus. From the fact that all music majors are members of the choir, a professor in the music department concluded that off campus is a music major.

What this question is testing

Sufficient Assumption

Your task

Find the assumption that, if added, guarantees the conclusion follows.

Common trap

Answers that only partly bridge the gap, leaving the conclusion unproven.

Winning move

Identify the new term in the conclusion and pick the choice that links it to the evidence.

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

The question
8.

The professor’s conclusion is properly drawn if which one of the following

Answer choices

  1. Correct71% picked this

    None of the students who live off campus is a member

    Why this is right

    This answer gives us this relationship. in Choir ---------> doesn't live off campus If we add that onto our premise, Music ? In major Choir Then we have derived the conclusion. Music ------------------------> doesn't live major off campus If you prefer it more conversationally, what do you get when you combine "none of the students who live off campus are in the choir" with the idea that "all music majors are in the choir"? You get, "none of the students who live off campus are music majors".

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

  2. Repeats a Premise5% picked this

    None of the students who are music majors has failed to

    Weird, I don't think I've ever seen this before, but this answer choice just repeats a premise. We were already told that "all music majors are members of the choir", so being told that "no music majors failed to join the choir" adds absolutely nothing because it means the same thing. We could throw this out without reading it, as it doesn't provide any information about students who live off campus.

  3. Out of Scope7% picked this

    Some of the students who do not live off campus are

    Out of Scope: don't live off campus This argument is only about the students who live off campus, so information about students who don't live off campus is irrelevant. Furthermore, weak language like Some will almost never be correct on Strengthen, Weaken, Paradox, Sufficient Assumption, and Principle-Strengthen. We could throw this out without reading it, as it doesn't provide any information about students who live off campus.

  4. Negation of Conclusion10% picked this

    All students who live on campus are

    We're trying to prove that if you live ? not a off campus music major And this answer is saying if you live ? you are a on campus music major That isn't functionally useful to us. If we're trying to prove that "Everyone who plays in the NFL is on steroids" It does nothing to say that "Everyone who doesn't play in the NFL is not on steroids." We could throw this out without reading it, as it doesn't provide any information about students who live off campus.

  5. No Impact7% picked this

    All students who are members of the choir are

    This just reverses the flow of a conditional we already knew. We were told that "all music majors are in choir" Music Major ? Choir And this says "all choir members are music majors" Choir ? Music Major We have no use for reversing that conditional. We are trying to prove a claim about students who live off campus (that none of them are music majors), and we know literally nothing about them. So if this answer doesn't provide us with information about students who live off campus then it's not even worth reading.

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free