Logical ReasoningDifficulty: Easy

PT130 S4 Q11 Explanation

Researcher: This fall I returned

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

TopicsNecessary Assumption

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Stimulus

Researcher: This fall I returned to a research site to recover the armadillos I had tagged there the previous spring. Since a large majority of the armadillos I recaptured were found within a few hundred yards of the location of armadillos do not move rapidly into new territories.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
11.

Which one of the following is an assumption required by the

Answer choices

  1. Too Weak3% picked this

    Of the armadillos living in the area of the tagging site last spring, few were able to avoid

    This means that most of the armadillos living in the area were tagged. But this has no information about whether they travel great distances.

  2. Weaken1% picked this

    Most of the armadillos tagged the previous spring were not recaptured during

    This makes it more likely that armadillos travel into new territories.

  3. Too Strong2% picked this

    Predators did not kill any of the armadillos that had been tagged

    Some of the armadillos could have been killed by predators and the argument would not be undermined.

  4. Out of Scope4% picked this

    The tags identifying the armadillos cannot be removed by the armadillos, either by

    Even if the tags could be removed, it does not speak to whether the recaptured armadillos are representative of armadillos more generally.

  5. Correct90% picked this

    A large majority of the recaptured armadillos did not move to a new territory in the intervening summer and then move back to

    Why this is right

    This rules out the possibility that the armadillos travel great distances during other parts of the year.

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

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