Logical ReasoningDifficulty: Hard

PT155 S4 Q11 Explanation

When using a manufactured

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

When using a manufactured pattern to make clothing, a tailor alters the pattern to accommodate any future distortion of the fabric. Also, unless the clothing is to be worn by a person whose measurements precisely match the pattern size, the tailor alters the pattern to fit the wearer exactly. but always adjusts the pattern to fit the wearer exactly.

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
11.

The conclusion follows logically if which one of the following

Answer choices

  1. Unrelated to Goal17% picked this

    Most manufactured patterns do not already accommodate the future distortion of fabrics that

    This is dealing with language from the first sentence, which was really just tangential background. Since the Conclusion is about always adjusting a pattern to fit wearer, we're just concerned with activating that conditional in the 2nd sentence that allows us to say "the tailor alters the pattern to fit the wearer". The about "altering the pattern to accommodate any future distortion" is a different alteration and not the concern of this conclusion.

  2. Too Weak / Irrelevant19% picked this

    At least some tailors who adjust patterns to the wearer and to the fabrics used

    We should be highly dubious on Sufficient Assumption of picking any answer that isn't of certain strength. We need to 100% prove the conclusion, so "some / most" type ideas won't be solid enough (unless the conclusion we're trying to prove is only about some/most). This answer has nothing to do with our goal, which is to be convinced that nobody ever matches the measurements on the pattern precisely.

  3. Trap4% picked this

    The best tailors are those most able to alter patterns to fit

    Unrelated to Goal Out of Scope: best We should always be scared to pick any Sufficient Assumption answer that brings in new concepts (and thus new loose ends), such as "the best tailors". The conclusion is about all professional tailors, so learning about only the best ones would not be exhaustive enough to help us prove the conclusion.

  4. Correct51% picked this

    All professional tailors sew only for people whose measurements do not exactly match

    Why this is right

    This answer removes the one possible objection to the conclusion, thereby proving the conclusion. If a professional tailor is sewing for someone, this answer tells us that we can be positive that the wearer has measurements that do not exactly fit the chosen pattern. And if clothing is to be worn by someone whose measurements don't precisely match the pattern, the tailor alters the pattern to fit them exactly. Thus, pro tailors always adjust the pattern to fit the wearer exactly.

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

  5. Unrelated to Goal9% picked this

    A professional tailor can always estimate exactly how much a fabric will

    This is dealing with language from the first sentence, which was really just tangential background. Since the Conclusion is about always adjusting a pattern to fit wearer, we're just concerned with activating that conditional in the 2nd sentence that allows us to say "the tailor alters the pattern to fit the wearer". We need to be convinced that there aren't people whose measurements already fit the pattern and thus create a situation in which a professional tailor wouldn't be adjusting a pattern to fit the wearer exactly.

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