Logical ReasoningDifficulty: Medium

PT124 S3 Q17 Explanation

Lawyer: A body of circumstantial

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

TopicsFlaw

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Stimulus

Lawyer: A body of circumstantial evidence is like a rope, and each item of evidence is like a strand of that rope. Just as additional pieces of circumstantial evidence strengthen the body of evidence, adding strands to the rope strengthens the rope. And if one strand breaks, the rope is not broken evidence are discredited, the overall body of evidence retains its basic strength.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that 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
17.

The reasoning in the lawyer's argument is most vulnerable to criticism on the grounds

Answer choices

  1. Correct72% picked this

    takes for granted that no items in a body of circumstantial evidence are significantly more critical to the strength of the evidence

    Why this is right

    This defends the argument from something that would be devastating to the argument. If some evidence was more important than other evidence, then the loss of an important piece of evidence could undermine the overall body of evidence.

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

  2. Irrelevant Comparison3% picked this

    presumes, without providing justification, that the strength of a body of evidence is less than the sum of the strengths of

    Whether the strength of a body of evidence is less than the sum of the strengths of the parts of that body or is greater than a multiple of the parts of that body is not relevant to the argument.

  3. Trap15% picked this

    fails to consider the possibility that if many items in a body of circumstantial evidence were discredited, the overall body

    Bad Objection (out of scope: many items) The argument is about what would happen if a few pieces of evidence (3 or 4) were discredited. The author thinks if only a few strands of the rope are lost, the rope is still pretty much the same, and if only a few pieces of evidence are discredited, the case is largely the same. But if many pieces were discredited, that could be an entirely different story. Many doesn't have a precise quantitative minimum, but we functionally use a shorthand like "at least 5 / at least 10 / at least a handful". Saying "many of my friends vape" is a stronger statement than saying "a few of my friends vape", so this potential objection would be beyond the scope of what the conclusion is addressing.

  4. Contradiction7% picked this

    offers an analogy in support of a conclusion without indicating whether the two types of things

    The argument does indicate that the two types of things compared share at least one similarity; adding strands to a rope strengthens it, just as additional pieces of circumstantial evidence strengthen the body of evidence.

  5. Wrong Flaw2% picked this

    draws a conclusion that simply restates a claim presented in support

    The argument’s conclusion is not stated as a premise. This describes the famous Circular Reasoning flaw, which shows up a ton as an incorrect answer but is almost never correct.

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