Logical ReasoningDifficulty: Easy

PT114 S2 Q5 Explanation

Logician: I have studied and

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

TopicsFlaw

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

Logician: I have studied and thoroughly mastered the laws of logic. So to argue that I sometimes violate the laws of logic in ordinary conversation would be like arguing laws of physics in everyday life.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that 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
5.

The reasoning in the logician’s argument is questionable because

Answer choices

  1. Not an Objection2% picked this

    ignores the fact that our conception of physical laws undergoes

    fails to consider / ignores possibility = the answer choice is offering a supposed Objection. We wouldn't be objecting to his conclusion by saying, "Oh, author, you're forgetting that our concept of physics (i.e. Newton's, then Einstein's ... ) is always changing". Does that attack the conclusion and make it seem like "a logician violating the laws of logic is not like a physicist violating the laws of physics"? Not in any obvious way. The author is just comparing them on the level of, "in both cases, a specialist is breaking the laws of her field". It doesn't seem to matter to him whether those laws are permanent or undergoing constant change.

  2. Not Assumed1% picked this

    presents no evidence that physics is as difficult to master

    "fails to establish / presents no evidence that" are less typical forms of answer choices describing supposed Assumptions. (the famous forms of Assumption answers are "presumes / takes for granted") We'd ask ourselves, "Did the author need to assume that physics is as difficult to master as logic?" No, the two fields don't need to be identical on that level. The author is only needing to assume that "a specialist breaking a law in logic is similar to a specialist breaking a law in physics".

  3. Not an Objection14% picked this

    fails to rule out the possibility that some physicist could circumvent the laws of physics

    fails to consider / overlooks possibility = the answer choice is offering a supposed Objection. We wouldn't be objecting to his conclusion by saying, "Oh, author, you're forgetting that it is possible for some physicist to circumvent the laws of physics in everyday life." I mean, yes, that would hurt his conclusion, but we would sound like the craziest lawyer in the courthouse. You can't violate the laws of physics. They are the physical laws of the universe: gravity, electromagnetism, nuclear forces, etc. What we could say is that the author fails to rule out the possibility that some logician could circumvent the laws of logic in everyday life. That's our objection.

  4. Correct82% picked this

    treats two kinds of things that differ in important respects as if they

    Why this is right

    This is complaining about the unfair comparison. Violating logic differs in an important respect from violating physics, in that the former is possible and the latter is impossible.

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

  5. Wrong Flaw2% picked this

    has a conclusion that contradicts what is asserted in

    This refers to the famous Self-Contradiction flaw, which will be a wrong answer choice 99% of the time we see it. If the conclusion were contradicting what was asserted in the premise, then the second sentence would have said something like, So, I have barely even looked at the laws of logic.

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