Logical ReasoningDifficulty: Hard

PT124 S1 Q21 Explanation

The trees always blossom

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

TopicsParallel Flaw

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Stimulus

The trees always blossom in May if April rainfall exceeds 5 centimeters. If April rainfall exceeds 5 centimeters, then the reservoirs are always full on May 1. The reservoirs were not full trees will not blossom this May.

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
21.

Which one of the following exhibits a flawed pattern of reasoning most similar to the flawed pattern of reasoning

Answer choices

  1. Correct70% picked this

    If the garlic is in the pantry, then it is still fresh. And the potatoes are on the basement stairs if the garlic is

    Why this is right

    Looks promising, two conditional premises: Garlic in pantry → fresh Garlic in pantry → potatoes on basement stairs We would want to hear that one of those right sides isn’t happening and then conclude that the other one isn’t happening either. Potatoes not on stairs. Thus, garlic is not fresh.

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

  2. Bad Premise Match3% picked this

    The jar reaches optimal temperature if it is held over the burner for 2 minutes. The contents of the jar liquefy immediately if the

    We should stop reading this after the first two sentences, because the two conditional premises do not have the same left side. We’re given these: held 2+ mins → optimal temp optimal temp → liquefy immediately These would actually chain together, which does not mimic the original.

  3. Bad Premise Match8% picked this

    A book is classified "special" if it is more than 200 years old. If a book was set with wooden type, then it is

    We should stop reading this after the first two sentences, because the two conditional premises do not have the same left side. We’re given these: more than 200 years old → special set with wooden type → more than 200 years old Again, like B, these two conditionals actually chain together.

  4. Bad Premise Match8% picked this

    The mower will operate only if the engine is not flooded. The engine is flooded if the foot pedal is depressed. The foot pedal

    We should stop reading this after the first two sentences, because the two conditional premises do not have the same left side. We’re given these: Mower operates → engine not flooded Foot pedal depressed → engine is flooded These two would also chain together, unlike the original.

  5. Bad Premise Match12% picked this

    If the kiln is too hot, then the plates will crack. If the plates crack, then the artisan must redo the order. The artisan

    We should stop reading this after the first two sentences, because the two conditional premises do not have the same left side. They chain together. We’re given these: Too hot → plates crack Plates crack → must redo order

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