How to identify and solve parallel reasoning and principle question types on the LSAT. Front: the question type. Back: a strategy tip for approaching it.
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- Parallel Reasoning: What is the core task?
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Identify the argument's logical structure (premises and conclusion), then find the answer choice that mirrors that same structure, not necessarily the same content.- Parallel Reasoning: Why diagram first?
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Breaking down the argument into premise-by-premise reduces noise. Write out: Premise 1 says X, Premise 2 says Y, Conclusion says Z. Then hunt for answers matching that shape.- Parallel Reasoning: When must quantifiers match?
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Always. If the original says 'some,' the answer must say 'some,' not 'all.' If the original uses 'no,' the parallel must use 'no.' Mismatched quantifiers kill the parallel.- Parallel Reasoning: Causal language trap
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If the original says 'X causes Y,' do not pick answers saying 'X correlates with Y' or 'X and Y co-occur.' Parallel requires the same causal claim, same direction.- Parallel Reasoning: Conditional statements strategy
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Map If...then structures carefully. If the original chains If A then B, and If B then C, the parallel must show the same chain, not a reversed or standalone conditional.- Parallel Reasoning: Temporal language matters
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If the original says 'before,' 'after,' or 'because then,' the parallel must preserve that timing. Swapping temporal sequence breaks the parallel.- Parallel Reasoning: Negation pitfall
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If the original negates a claim ('Not all X are Y'), do not confuse it with a positive claim ('Some X are not Y'). The parallel must match the negation structure exactly.- Parallel Reasoning: Exclusive language ('only')
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If the original says 'only X qualify,' the parallel must say 'only,' not 'all' or 'most.' Exclusive phrasing is structural and must match precisely.- Parallel Reasoning: Read the conclusion first
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The conclusion reveals the argument's core claim. Once you know what the argument concludes, you can recognize when answer choices diverge from that structure.- Parallel Reasoning: Pronoun and reference tracking
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If the original refers to 'this' or 'that' and then applies a rule to it, the parallel must show the same reference flow. Lost pronouns mean a broken parallel.- Principle questions: Identify the variant first
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Ask: Does this question ask me to apply a rule to a new scenario, or to recognize which principle an example illustrates? The variant determines your strategy.- Principle: Apply-the-principle variant
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A broad rule is given in the stimulus. Pick the answer that correctly follows that rule when applied to a new situation. Test each answer against the rule's logic.- Principle: Illustrates-the-principle variant
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The stimulus gives a concrete example. The question asks which principle the example best illustrates. Reverse engineer the rule from the example.- Principle: Working with broad rules
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Abstract principles can feel vague. Make them concrete: rephrase 'Efficiency should be balanced against fairness' as 'If a choice saves time but harms someone unfairly, do not make it.'- Principle: Concrete examples strategy
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When the stimulus describes a specific situation, extract the pattern: Why did this actor choose this action? What value or rule drove the choice? That is the principle.
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