Logical ReasoningDifficulty: Hard

PT101 S3 Q10 Explanation

All material bodies are divisible

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

TopicsSufficient Assumption

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Stimulus

All material bodies are divisible into parts, and everything divisible is imperfect. It follows that all material bodies are imperfect. It likewise follows not a material body.

What this question is testing

Sufficient Assumption

Your task

Find the assumption that, if added, guarantees the conclusion follows.

Common trap

Answers that only partly bridge the gap, leaving the conclusion unproven.

Winning move

Identify the new term in the conclusion and pick the choice that links it to the evidence.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
10.

The final conclusion above follows logically if which one of the following

Answer choices

  1. Unrelated to Goal5% picked this

    Everything divisible is a material

    This says nothing about "spirit" so it can't possibly allow us to prove a claim about "spirit" (we currently have no premises about "spirit", so this answer must provide us with one).

  2. Unrelated to Goal7% picked this

    Nothing imperfect is

    This says nothing about "spirit" so it can't possibly allow us to prove a claim about "spirit" (we currently have no premises about "spirit", so this answer must provide us with one).

  3. Doesn't Help3% picked this

    The spirit is

    This gives us spirit ? divisible and we're trying to add it onto premises in order to derive spirit ? ~material body We have a rule that says divisible ? imperfect So we can combine this answer choice with the 2nd claim from the argument and derive that: spirit ? divisible ? imperfect But is there a way to get from "imperfect" to "not material body"? No. We have a connection that says material body ? imperfect But we would need one that says imperfect ? ~material body

  4. Correct68% picked this

    The spirit is

    Why this is right

    This is what we predicted. We have this relationship in our Evidence: material body ? imperfect perfect ? not material body So if we add on this answer choice spirit ? perfect to that premise perfect ? not material body then we've derived the conclusion: spirit --------------> not material body

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

  5. Unclear Impact16% picked this

    The spirit is either indivisible or

    Sometimes correct answers do function off an either/or choice. You just have to prove that in either case, you get to the conclusion. If spirit is indivisible, then we know that it's not a material body (from the very first claim in the argument). So in that world, we will have proven the conclusion. But what about the world in which the spirit is imperfect? If spirit is imperfect, we can't say anything about whether or not it's a material body. In fact, since we know that all material bodies are imperfect, it seems possible that the spirit is a material body. This answer is confusing because in one of its two possible worlds, we definitely DO prove the conclusion. But we don't know for sure that we live in that world, so we haven't definitively proven the conclusion. Say that I'm trying to prove that Gus loves Taylor Swift. We have rule that says: if you're at T-Swift's show, you love her. If I tell you that Gus is at T-Swift's show or he's at the bowling alley, have I convinced you that Gus loves Taylor Swift? Of course not. That's what this answer is doing.

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