Logical ReasoningDifficulty: Medium

PT119 S2 Q24 Explanation

It is now clear that the

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

TopicsFlaw

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Stimulus

It is now clear that the ancient Egyptians were the first society to produce alcoholic beverages. It had been thought that the ancient Babylonians were the first; they had mastered the process of fermentation for making wine as early as 1500 B.C. However, archaeologists have discovered an Egyptian cup dating from 2000 whose chemical residue reveals that it contained a form of alcoholic beer.

What this question is testing

Flaw

The Argument

The author finds an Egyptian cup from 2000 B.C. with beer residue and a picture of a brewery on it. That is older than the Babylonian wine evidence from 1500 B.C. So, the author concludes, Egyptians were the first society to produce alcoholic beverages.

Evaluate

The leap is from "oldest evidence we have so far" to "first ever." Those are not the same.

It is like saying, Maybe — but maybe earlier dinosaurs existed and we just have not found their fossils yet, or those fossils were destroyed by time.

Goal

The right answer should call out this gap: the earliest known instance is not necessarily the first instance.

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.

The reasoning above is most vulnerable to criticism on which one of

Answer choices

  1. Bad Description12% picked this

    It makes a generalization about Egyptian society based on a sample so small that it is

    This describes a sampling flaw — generalizing about Egyptian society from a tiny, unrepresentative sample. The argument is not making a claim about Egyptian society in general; it is making a single claim about whether any earlier society produced alcohol. The cup is offered as one piece of evidence, not as a sample from which a generalization is drawn. This is the wrong flaw.

  2. Equivocation4% picked this

    It uses the term “alcoholic beverage” in a different sense in the premises than

    The argument uses "alcoholic beverage" the same way throughout — including beer in Egypt and wine in Babylon. Both are alcoholic beverages by the same definition. There is no shift in meaning between premise and conclusion.

  3. Bad Description4% picked this

    It presumes, without providing justification, that because one society developed a technology before another, the development in the latter was dependent on

    The argument never claims Babylonian alcohol production depended on Egyptian alcohol production. It just says Egyptians came first. There is no claim of causal influence between the two societies, so there is no flaw of presuming such dependence.

  4. Correct79% picked this

    It ignores the possibility that the first known instance of a kind is not the first

    Why this is right

    This nails the gap. The Egyptian cup is the first known instance of alcohol production, but the conclusion claims the Egyptians were the first ever to produce alcohol. Those are not the same. Some other society — or earlier Egyptians — could have produced alcohol before 2000 B.C. without leaving (or having yet found) archaeological evidence. The argument simply assumes "earliest known" equals "earliest, period," which is exactly the criticism this answer raises.

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

  5. Bad Description1% picked this

    It provides no evidence for the claim that the Babylonians produced wine as early

    The argument does not need to defend the claim that Babylonians produced wine in 1500 B.C. — that is the existing view the argument is overturning, and even if we accept it, the argument still works the way it does (the Egyptian evidence is older). The flaw is not in failing to support the Babylonian date.

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