Logical ReasoningDifficulty: Hard

PT107 S4 Q21 Explanation

All too many weaklings are also

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

TopicsParallel Flaw

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Stimulus

All too many weaklings are also cowards, and few cowards fail to be fools. Thus there must be at least one person weakling and a fool.

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
21.

The flawed pattern of reasoning in the argument above is most similar to that in which one

Answer choices

  1. Bad Premise Match Valid Logic10% picked this

    All weasels are carnivores and no carnivores fail to be nonherbivores, so some

    These premises are All and None. We wanted stuff like Many and Most. Because of the stronger language of the premises, this is actually valid. All W's are C. All C's are N's. Thus, some W's are N's.

  2. Bad Conclusion Match15% picked this

    Few moralists have the courage to act according to the principles they profess, and few saints have the ability to articulate the principles by

    The conclusion is not making a Trait Overlap inference, "Some A's are B". It's making a stronger claim and it's about traits NOT overlapping: "most people can't be both A and B". Most M's don't have the courage. Most S's can't articulate. Thus, most people do not have both the courage and the ability to articulate.

  3. Correct49% picked this

    Some painters are dancers, since some painters are musicians, and some

    Why this is right

    This is certainly structurally drifting from the original quantifiers, since it's using "some" across the board. But we still get the "A to B / B to C" premises and then a conclusion trying to make a "A to C" trait overlap inference. Also, since (A), (D), and (E) are all airtight arguments, this answer only has to be more similar to the original than (B) to win. Like happens in many correct Parallel answers, the order of ingredients has been scrambled. We need to use the Support Indicator "since" to realize that the first claim is the Conclusion. P1: Some P's are M P2: Some M's are D C: Some P's are D

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

  4. Bad Premise / Conclusion Match Valid Logic2% picked this

    If an act is virtuous, then it is autonomous, for acts are not virtuous unless they are free, and acts are not

    The conclusion here is Conditional, so we can instantly reject this answer and move on. The premises are also conditional, so if we kept reading we would see even more reason to drop this. Finally, the logic is actually valid, not flawed. The conclusion is shown to us indirectly, by the Support Indicator "for". P1: Virtuous → Free P2: Free → Autonomous C: Virtuous → Autonomous

  5. Weak Premise Match Valid Logic23% picked this

    A majority of the voting population favors a total ban, but no one who favors a total ban is opposed to stiffer tariffs, so

    The premises here are stronger than the original because we have a Most and No/All. The conclusion does seem to be making a trait overlap inference. But if we analyze the logic we see that it's a valid conclusion to draw. P1: Most voters favor ban. P2: favor ban → not opposed to ST's C: Some voters are not opposed to ST's

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