Logical ReasoningDifficulty: Medium

PT136 S2 Q10 Explanation

Computer manufacturers have sought

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

TopicsNecessary Assumption

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Stimulus

Computer manufacturers have sought to make computer chips ever smaller, since decreasing the size of a computer's central processing unit (CPU) chip—without making that CPU chip any less sophisticated—will proportionally increase the speed of the CPU chip and the computer containing it. But since CPU their sophistication, computers cannot currently be made significantly faster.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

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.

Which one of the following is an assumption on which the

Answer choices

  1. Correct74% picked this

    Computers cannot currently be made faster unless their CPU chips are

    Why this is right

    If you didn't predict the assumption that "making CPU smaller is the only way to make computers faster", then you would deal with this the way we can deal with any conditional answer choice: write out how the rule would look and ask yourself if the author made that move. Unless = "if not", so this answer says CPU chips Computers cannot are not ? currently be made made smaller faster If that rule seems to match the argument core, then pick it. Here, the author definitely went from a premise about CPU chips not being able to be made smaller to a conclusion about computers not being able to be made faster.

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

  2. Too Strong3% picked this

    Even if CPU chips are made slightly less sophisticated, they cannot currently be

    The author is only claiming that the chips can't be made smaller without decreasing sophistication. She might totally agree that they can currently be made much smaller, as long as we decrease their sophistication.

  3. Out of Scope17% picked this

    If both the size and the sophistication of a CPU chip are decreased, the speed of

    Out of Scope: decreasing size and sophistication The author never covered what would happen if both the size and the sophistication of a chip were decreased. Presumably, the overall effect on the speed of the chip would depend on how much we decreased the size vs. sophistication. If we decreased them both proportionately, the speed might be unchanged.

  4. Out of Scope: what manufacturers believe1% picked this

    Few, if any, computer manufacturers believe that computers can be made

    This argument is about whether computers currently can / can't be made significantly faster. The truth of that proposition has nothing to do with what quantity of manufacturers believe it to be true.

  5. Weakens6% picked this

    Increasing the sophistication of a CPU chip without increasing its size will proportionally

    This actually poses an alternative way to make computers faster, so this weakens the author's argument; she is assuming that making CPU chips smaller (but equally sophisticated) is the only way.

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