Logical ReasoningDifficulty: Hard

PT148 S3 Q24 Explanation

Library preservationist: Due to

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

TopicsMust be True

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Stimulus

Library preservationist: Due to the continual physical deterioration of the medieval manuscripts in our library's collection, we have decided to restore most of our medieval manuscripts that are of widely acknowledged cultural significance, though this means that some medieval manuscripts whose authenticity is suspect will be restored. However, only manuscripts whose safety manuscripts that are not frequently consulted by researchers will not be restored.

What this question is testing

Must be True

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
24.

If all of the library preservationist's statements are true, which one of the following must be true of the medieval manuscripts

Answer choices

  1. Correct66% picked this

    Some of the medieval manuscripts whose authenticity is suspect are frequently

    Why this is right

    We were told that "some of the medieval manuscripts whose authenticity is suspect" will be restored. And we were told in the final claim that "if it's going to be restored, then it's frequently consulted by researchers". If we put those two ideas together, we get this answer.

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

  2. Too Strong: all6% picked this

    All of the medieval manuscripts widely acknowledged to be of cultural significance are manuscripts whose safety can be

    We could pick this answer if it said "Most". We know that most of the medieval manuscripts widely acknowledged to be of cultural significance will be restored, and we know that "if it's going to be restored, then its safety can be ensured". So we know that "most of the culturally significant manuscripts have safety that can be ensured". But we don't know whether all of them are that way.

  3. Illegal Logic13% picked this

    All of the medieval manuscripts whose safety can be ensured during the restoration process are

    This is trying to tie together two outcomes that spring from the same trigger. Will be restored → safety can be ensured Will be restored → frequently consulted We never allowed to look at two rules like that and then assume a conditional relationship between the outcomes. Suppose we had these two conditionals about being male: Male → has y-chromosome Male → loves mother We couldn't say "All people who love their mother have y-chromosomes", because of course women love their mothers too but do not have y-chromosomes.

  4. Too Strong8% picked this

    The medieval manuscripts most susceptible to deterioration are those most frequently

    Too Strong: most susceptible Relative vs. Absolute We heard in absolute terms that many of these medieval manuscripts are susceptible to deterioration. But there isn't any information about different degrees of susceptibility. We don't know anything about which manuscripts are most susceptible to deterioration.

  5. Too Strong: none7% picked this

    None of the medieval manuscripts that are rarely consulted by researchers is widely acknowledged to

    Let's say there are 100 medieval manuscripts that are acknowledged to be of cultural significance. The paragraph told us that most of them (51) will be restored. We know that all the ones being restored are frequently consulted, so all 51 of those are frequently consulted. That still leaves 49 medieval manuscripts that are acknowledged to be of cultural significance that aren't being restored. Couldn't at least one of them be something that is rarely consulted by researchers? Certainly! Thus this answer could be disproven. If at least one of those 49 culturally significant manuscripts is rarely consulted, then it's false to say "none of the rarely consulted ones are culturally significant". One way to deal with this answer is to just think about the trigger it's giving us: rarely consulted → not culturally significant Do we know anything that springs from that trigger? rarely consulted → ? ? ? Yes, we know that rarely consulted are not restored. rarely consulted → not restored So to make this answer work, we'd ask ourselves whether we were given this relationship. not restored → not culturally significant culturally significant → restored We were not. We were only told that most culturally significant would be restored, not that all of them would be. In that sense, this answer has the same problem as (B) did.

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