Logical ReasoningDifficulty: Hard

PT126 S1 Q17 Explanation

It is a mistake to conclude

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

TopicsNecessary Assumption

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

It is a mistake to conclude, as some have, that ancient people did not know what moral rights were simply because no known ancient language has an expression correctly translatable as "a moral right:" This would be like saying that a person who discovers a wild fruit tree and returns repeatedly to what the fruit is until naming it or learning its name.

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
17.

Which one of the following is an assumption required by

Answer choices

  1. Too Strong (conditional) / Opposite5% picked this

    To know the name of something is to know what that

    The author is actually trying to separate these two concepts. The author is driving home the point that we might know something even though we don’t know the name for it. He could similarly believe that someone might know the name for something without really knowing it.

  2. Irrelevant Comparison2% picked this

    People who first discover what something is know it better than do people who merely know the

    The author is only speaking in absolute language, about whether or not someone knows a thing / knows a name. There is no relative language that tip us off that in one situation you know better than in another situation.

  3. Too Strong: “can’t provide any”8% picked this

    The name or expression that is used to identify something cannot provide any information about the nature of

    The author isn’t saying that names are worthless when it comes to knowing things. She’s only saying that names aren’t necessary in order to know a thing.

  4. Correct71% picked this

    A person who repeatedly harvests from a wild fruit tree and studies it has some idea of what the fruit is even before

    Why this is right

    This completes the analogy. In each case, a person doesn’t have a word for something, but in each case the author believes that the person does still know what something is.

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

  5. Reversal14% picked this

    One need not know what something is before one can

    Close, but the author is assuming “One need not have a name for something before one can know what something is”. The author could believe that knowing comes first, naming comes second. In that case, one does need to know what something is before one can name it.

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free