Logical ReasoningDifficulty: Easy

PT132 S4 Q15 Explanation

Jewel collectors, fearing

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

TopicsPrinciple-Strengthen

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Stimulus

Jewel collectors, fearing that their eyes will be deceived by a counterfeit, will not buy a diamond unless the dealer guarantees that it is genuine. But why should a counterfeit give any less aesthetic pleasure when the naked eye Both jewels should be deemed of equal value.

What this question is testing

Principle-Strengthen

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
15.

Which one of the following principles, if valid, most helps to justify the reasoning in

Answer choices

  1. Unrelated to Goal2% picked this

    Jewel collectors should collect only those jewels that provide the most

    This is a rule about which jewels collectors should collect. We need a rule about how jewelers should deem the value of something.

  2. Bad Premise Match1% picked this

    The value of a jewel should depend at least partly on

    This principle is correctly about how do deem a jewel's value, but it should be talking about how much aesthetic pleasure the jewel provides or whether the naked eye can distinguish it from another jewel. The premise had nothing to do with "market demand".

  3. Unrelated to Goal2% picked this

    It should not be assumed that everyone who likes diamonds receives the same degree of

    This is a rule that lets you conclude how much aesthetic pleasure you should / shouldn't assume someone gets from a diamond. We need a rule that helps us conclude that a diamond and a virtually identical counterfeit should be deemed of equal value.

  4. Correct89% picked this

    The value of a jewel should derive solely from the aesthetic

    Why this is right

    This is correctly a rule about how to determine the value of a jewel (the conclusion), and the basis for that is correctly talking about what was discussed in the premise (aesthetic value). Since the author is implying that counterfeits and genuine diamonds provide the same aesthetic pleasure, according to this rule they would be deemed to have equal value. If aesthetic pleasure is the sole measure of value, then things that provide equivalent aesthetic pleasure would be equivalently valuable.

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

  5. Unrelated to Goal6% picked this

    Jewel collectors should not buy counterfeit jewels unless they are unable to distinguish counterfeit jewels

    This is a rule that would help us say that a jewel collector should not buy certain jewels. We need a rule that lets us say that a jewel collector should deem two jewels to be of equal value.

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