Logical ReasoningDifficulty: Hard

PT114 S2 Q18 Explanation

It is impossible to do science

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

TopicsParallel

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Stimulus

It is impossible to do science without measuring. It is impossible to measure without having first selected units of measurement. Hence, science is arbitrary, since the selection mile, fathom, etc.—is always arbitrary.

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
18.

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

Answer choices

  1. Correct61% picked this

    Long hours of practice are necessary for developing musical skill. One must develop one’s musical skill in order to perform difficult music. But long

    Why this is right

    This looks good. Everything can be matched. Science requires measuring. Performing hard music requires developing music skill Measuring requires selecting units. Developing music skill requires long hours. Selecting units is arbitrary. Long hours are tedious. So, Science is arbitrary. Performing hard music is tedious. P1: A → B P2: B → C P3: C is X. C: A is X.

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

  2. Bad Evidence Match8% picked this

    You have to advertise to run an expanding business, but advertising is expensive. Hence, it is expensive

    One quick way to discount this one is that there are only 2 premises, whereas the original argument had 3. Those two premises can chain together, but there's no 3rd premise to give us the C to D action we need. We could pile on and say the conclusion is also invalid. It should say "it is expensive to run an expanding business", not refer to all businesses.

  3. Bad Evidence Match9% picked this

    It is permissible to sit on the park benches. To sit on the park benches one must walk to them. One way to walk

    We need at least two conditional premises that chain together. This argument only has one conditional premise ("one must walk"). The other two aren't conditional - it's permissible - one way is We can say that "Sitting on the benches requires walking to them", but we can't chain on to that and say that "walking to the benches requires [some other thing]". So it dies there.

  4. Bad Evidence Match21% picked this

    It is impossible to be a manager without evaluating people. The process of evaluation is necessarily subjective. Thus, people resent managers because

    One quick way to discount this one is that there are only 2 premises, whereas the original argument had 3. We'd be able to say that "being a manager requires evaluating people, and evaluating people requires subjectivity". But there's no 3rd premise to give us the C to D action we need. The argument would have to go on to say something like, "And since subjectivity is judgmental, being a manager is judgmental".

  5. Bad Conclusion Match1% picked this

    Some farming on the plains requires irrigation. This irrigation now uses water pumped from aquifers. But aquifers have limited capacity and continued pumping will

    One quick way to discount this one is that the conclusion brings in a brand new concept "a new source of water". We also don't have premises that chain together. We can say "some farming requires irrigation", but then there's nothing to add on to that with "irrigation requires [some other thing]". They say that irrigation now uses water pumped from aquifers, but it's not presented as a required consequence of irrigation, so it doesn't chain up like in our original.

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