Logical ReasoningDifficulty: Medium

PT119 S2 Q20 Explanation

Professor Donnelly’s exams are always

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

TopicsParallel Flaw

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Stimulus

Professor Donnelly’s exams are always more difficult than Professor Curtis’s exams. The question about dinosaurs was on Professor Donnelly’s last must be difficult.

What this question is testing

Parallel Flaw

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
20.

Which one of the following exhibits both of the logical flaws exhibited in

Answer choices

  1. Weak Evidence Match11% picked this

    Lewis is a better baker than Stockman. Lewis made this cake. Therefore, it must be better than

    The relationship of cake to baker isn't a great Part vs. Whole match. And the conclusion is strangely comparing this cake to most of Stockman's cakes.

  2. Correct74% picked this

    Porter’s new book of poetry is better than any of her other books of poetry. This poem is from Porter’s new book,

    Why this is right

    This has the Whole to Part move, because it reasons that since the whole book is good, the poem must be good. And it has the Relative to Absolute move, because it goes from saying that something is better to saying that something is good.

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

  3. Trap2% picked this

    Professor Whitburn is teaching English this year and always assigns a lot of reading. Therefore, this year’s English class will have to do

    No Part vs. Whole Absolute to Relative Topic Trap The evidence and the conclusion are both about a "whole", the overall amount of reading assigned in Professor W's class. There is a move from Absolute to Relative, which is a reverse of the original. We go from "a lot of reading" (absolute) to "more reading" (relative). Beware answer choices that seem to recycle the topic of the original argument.

  4. No Part vs. Whole5% picked this

    Shield’s first novel has a more complicated plot than any other that she has written. Hence, that plot

    This does have a Relative to Absolute move, from "more complicated" to "complex". But it lacks the Part vs. Whole move, since both the premise and the conclusion are about the plot.

  5. No Relative vs. Absolute8% picked this

    Mathematics is more difficult than history. Therefore, my calculus test will be more difficult than

    This does have a Part to Whole move, from "math / history" to "math test / history test". But it lacks a a Relative vs. Absolute move, since both the premise and the conclusion deal with "more difficult".

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