Logical ReasoningDifficulty: Medium

PT155 S2 Q19 Explanation

Although the slightest difference

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

TopicsParallel

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Stimulus

Although the slightest difference in shades of paint is noticeable, it is pointless to spend much time trying to match an old paint precisely when repainting only part of the interior of a house. This is because paint fades somewhat in the months after it has been applied. Thus, even if a paints will no longer match after a year or so.

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
19.

The reasoning in which one of the following is most similar to that in

Answer choices

  1. Correct77% picked this

    A bicycle is most comfortable to ride when the wheels are perfectly aligned. However, because the position of a bike wheel always shifts a

    Why this is right

    The conclusion is saying that a certain effort at perfection would be pointless (it's useless), based on the fact that even if it starts off right, it will inevitably drift away from perfection (always shifts a bit when ridden).

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

  2. Weak Conclusion Match Bad Premise Match3% picked this

    It is rarely worthwhile to look for parts for an older car. Because most cars do not last more than 20 years, it is

    We could already start distancing ourselves from this with the conclusion's "rarely worthwhile" strength. We're trying to match a conclusion that is more like "never worthwhile". Also, the Premise doesn't have anything to do with "even if you nail it at first, it'll drift away from perfection".

  3. Bad Conclusion Match3% picked this

    Keeping hair healthy requires using a shampoo designed specifically for one’s hair type. However, hair will become unhealthy if washed consistently with the same

    We'd save ourselves time and brainpower by checking the conclusion first and seeing that "you should alternate between A and B" is a terrible match for the original's "it is pointless to do A". The premises here have a little bit of "drift from perfection" in them, but there's no point in trying to even make it work when the conclusion makes it dead on arrival.

  4. Bad Premise Match5% picked this

    Although cookies made with butter have a better texture than do cookies made with margarine, it is pointless to spend the extra money needed

    The conclusion is definitely saying that a certain strategy is pointless. Is the evidence saying "even if you start out perfect, you'll drift away from perfection"? No, it's saying "an inferior but easier to acquire alternative is close enough that you might as well just go with that".

  5. Weak Premise Match12% picked this

    Unless the size and shape of a dress exactly matches the size and shape of its lining, the dress will hang unevenly when it

    The conclusion does say a certain strategy would be pointless. Does the evidence say that "even if you nail it at first, you'll eventually drift from perfection"? No, it says "almost no one will notice an imperfect attempt, so why bother".

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