Logical ReasoningDifficulty: Hard

PT110 S2 Q10 Explanation

Although the charter of Westside

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

TopicsSufficient Assumption

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Stimulus

Although the charter of Westside School states that the student body must include some students with special educational needs, no students with learning disabilities have yet enrolled in the currently in violation of its charter.

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
10.

The conclusion of the argument follows logically if which one of the

Answer choices

  1. Reversed Logic21% picked this

    All students with learning disabilities have special

    This says learning disabilities ? special ed. needs We wanted if they have no students ? then they have none w/ with learning disabilities special ed. needs If we knew that "all students with special educational needs have learning disabilities", then knowing there are no students with learning disabilities would tell us that there are no students with special educational needs. But this answer is saying the reverse, that all students with learning disabilities have special educational needs. Another way to put it would be this -- the reason we didn't believe the conclusion in the original argument is that it's possible that Westside is not in violation of its charter, that it does have students with special educational needs, just not students with learning disabilities. For example, a deaf child or a child in a wheelchair may have special educational needs but not a learning disability (such as dyslexia / ADHD). Westside could say, "We're not in violation. Sure we don't have any students with learning disabilities, but we have some deaf students, and they have special educational needs". Does this answer rule out that objection? No. Meanwhile, a reversed version of this answer, "All students with special educational needs have learning disabilities" would rule out that objection. You couldn't say, "Sure we don't have students with learning disabilities, but we still have students with special ed needs" if it were true that "all students with special ed needs have learning disabilities".

  2. Reiterates a Premise9% picked this

    The school currently has no student with

    Strangely, this answer just tells us what we already know (or at least a closely related inference). We already knew that no student with learning disabilities had enrolled in the school, which tells us logically that no students with learning disabilities attend the school. (You can't be said to "attend a school" if you're not enrolled there) Since this answer adds nothing we didn't already know, it can't be right. Also, we know that we're specifically trying to get from, "if no one has learning disabilities, then no one has special educational needs".

  3. Out of Scope: should2% picked this

    The school should enroll students with special

    The correct answer to Sufficient Assumption (almost?) never introduces brand new concepts. In this case "should" is totally new. We're only evaluating whether Westside is / isn't in violation of charter, not whether they should / shouldn't be.

  4. Correct66% picked this

    The only students with special educational needs are students with

    Why this is right

    We need to be able to make this move: if they have no students ? then they have none w/ with learning disabilities special ed. needs This answer says have special ed needs ? have learning disabilities "the only" means put it on the left, whereas "only if" and "only" (much more common on LSAT) means put it on the right. The contrapositive of this rule sounds like this: "if they don't have learning disabilities then they don't have special educational needs". This is allowing us to get from if they have no students ? then they have none w/ with learning disabilities special ed. needs since any student w/o learning disabilities cannot be considered a student with special educational needs, according to this answer. Formally, Westside ----------------------------------> violation of charter Westside --> no S's no S's ---> violation w/ LD's w/ SEN of charter The only thing we're missing in order to build the logic path of the Conclusion is the link provided by this answer: no S's ----> no S's w/ LD's w/ SEN

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

  5. Out Of Scope: Can't Be Modified2% picked this

    The school’s charter cannot be modified in order to avoid its

    Like (C), this brings in a brand new concept. In this case, it's whether or not the charter can be modified. But the argument is only about whether the charter, as written, is currently being violated.

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