Logical ReasoningDifficulty: Medium

PT133 S2 Q24 Explanation

Ecologists predict that the incidence

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

TopicsParallel

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Stimulus

Ecologists predict that the incidence of malaria will increase if global warming continues or if the use of pesticides is not expanded. But the use of pesticides is known to contribute to global warming, so it is in malaria in the years to come.

What this question is testing

Parallel

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
24.

The pattern of reasoning in which one of the following is most similar to that in

Answer choices

  1. Wrong Conclusion6% picked this

    The crime rate will increase if the economy does not improve or if we do not increase the number of police officers. But we

    The crime rate will E↑ or PO↑ → CR↑ increase if the economy does not improve or if we do not increase the number of police officers. But we will be able E↑ → PO to hire more police officers if the economy does improve. Therefore, the CR↑ crime rate will not increase. The conclusion should say that the crime rate will increase.

  2. Wrong Premise10% picked this

    If educational funds remain at their current level or if we fail to recruit qualified teachers, student performance will worsen. But we will fail

    If educational funds remain at their current level [do not (EF↑ + EF↓) increase and do not or decrease] or if we fail to RQT → SP↓ recruit qualified teachers, student performance will worsen. But we will fail to recruit RQT qualified teachers. Therefore, student SP↓ performance will worsen. Only one of the two premises contains an if/then relationship

  3. Correct73% picked this

    If interest rates increase or demand for consumer goods does not decline, inflation will rise. But if there is a decline in the demand

    Why this is right

    If interest rates IR↑ or D↓ → IF↑ increase or demand for consumer goods does not decline, inflation will rise. But if there is a decline D↓ → IR↑ in the demand for consumer goods, that will lead to higher interest rates. Inflation will rise. IR↑ The reasoning and validity match those in the stimulus.

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

  4. Wrong Premise / Wrong Conclusion4% picked this

    If global warming continues or if the rate of ozone depletion is not reduced, there will be an increase in the incidence of skin

    If global warming continues GWC or if the rate of ozone or depletion is not reduced, OD↓ → SC↑ there will be an increase in the incidence of skin cancer. But reduced use of A↓ → GWC + OD↓ aerosols ensures both that global warming will not continue and that ozone depletion will be reduced. The incidence of skin cancer SC↓ will not decrease. First, the second premise contains an "and" statement in the necessary condition. Second, technically, the conclusion should be that there will be an increase in the incidence of skin cancer will not decrease.

  5. Wrong Premise7% picked this

    If deforestation continues at the current rate and the use of chemicals is not curtailed, wildlife species will continue to become extinct. But because

    If deforestation continues at the (DF↑ + DF↓) current rate [does not increase + and does not decrease] and the UC↓ → WE use of chemicals is not curtailed, wildfire species will continue to become extinct. But because of increasing (DF↑ + DF↓) population worldwide, it is + inevitable that the current rate UC↓ of deforestation will continue [will not increase and will not decrease] and that the use of chemicals will not be curtailed. Thus, wildlife species will WE continue to become extinct. The first premise includes an "and" that should be an "or." The second premise does not provide an if/then relationship.

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