Logical ReasoningDifficulty: Hard

PT147 S1 Q26 Explanation

Some eloquent speakers impress

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

TopicsParallel Flaw

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Stimulus

Some eloquent speakers impress their audiences with the vividness and clarity of the messages conveyed. Speakers who resort to obscenity, however, are not genuinely these speakers impress their audiences.

What this question is testing

Parallel Flaw

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
26.

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

Answer choices

  1. Bad Premise Match Valid Logic7% picked this

    A culture without myths will also lack fundamental moral certainties. Thus, this culture must lack fundamental moral certainties, since

    Let's look at our two premises: This culture is devoid of myth. A culture without myths will lack fundamental moral certainties. Can anything be properly concluded by combining those ideas? Sure, it proves that "this culture will lack fundamental moral certainties". That's what the actual conclusion says, so this is airtight logic. The two premises here were like this: P1: This A is B. P2 All B's are C. C: thus, This A is C This inference works, because the common ingredient in the two premises is the trigger of the conditional premise. Meanwhile, in our original argument, the common ingredient was not the trigger. P1: Some A's are B P2: C's are not A C: thus, C's are not B If we rewrote Premise 2, we could make A the trigger, but then the conclusion would be different. P1: Some B's are A P2: All A's are not C. The valid conclusion would be "Some B's are not C", or "Some people who impress their audiences are not obscene". But the original conclusion is not valid, whereas the conclusion on this answer choice is.

  2. Bad Conclusion Match Valid Logic16% picked this

    There are authors who write one page a day and produce one book per year. Serious authors, however, do not write one page per

    The quickest way to distance ourselves from this answer would be seeing that the conclusion here is just a some statement, whereas the original conclusion pertained to all obscene speakers. Let's look at the two premises: - Serious authors don't write one page per day - There are authors who write one page a day and produce one book per year. Can we infer anything? Sure we could infer that some authors who produce one book per year are not serious authors. And since that is what the conclusion says, this is valid logic. This argument was essentially this: P1: Some A's are B P2: All C's are not A C: Some B's are not C. The original argument was this: P1: Some A's are B P2: All C's are not A C: thus, C's are not B

  3. Bad Conclusion Match Weak Premise Match5% picked this

    Cities that are centers of commerce are always centers of industry as well. It follows that some centers of commerce are small cities, since

    The quickest way to distance ourselves from this answer would be seeing that the conclusion here is just a some statement, whereas the original conclusion pertained to all obscene speakers. Let's look at the two premises: - Some centers of industry are not small cities - All cities that are centers of commerce are centers of industry Can we infer anything? No, we can't. The overlapping term ("center of industry") is not the trigger of the conditional. This argument looks like this: P1: Some A's are not B. P2: All C's are A. C: Some C's are B. The original argument was this: P1: Some A's are B P2: All C's are not A C: All C's are not B

  4. Bad Conclusion Match Weak Premise Match6% picked this

    Most farmers like living in rural areas. Since Carla is not a farmer, she probably would not enjoy

    The quickest way to distance ourselves from this answer would be seeing that the conclusion here is a probably statement, whereas the original conclusion was a certain statement about all obscene speakers. Let's look at the two premises: - Most farmers like living in rural areas. - Carla is not a farmer. Can we infer anything? No, we can't. If Carla were a farmer, we could infer that she "probably likes living in rural areas". This argument looks like this: P1: Most A's are B. P2: C is not A. C: C is probably not B. The original argument was this: P1: Some A's are B P2: All C's are not A C: All C's are not B

  5. Correct67% picked this

    Sculptors sometimes produce significant works of art. But musicians are not sculptors. Hence, musicians never produce

    Why this is right

    This matches the original. Some A's are B Some eloquent speakers impress their audience. Some sculptors produce significant works of art. All C's are not A All obscene speakers are not eloquent. All musicians are not sculptors. All C's are not B All obscene speakers do not impress their audience. All musicians do not produce significant works of art.

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

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