LSATLaw SchoolTest Prep

LSAT Logical Reasoning Essentials— MintDeck

120 cards covering the reasoning toolkit the LSAT actually tests — every major Logical Reasoning question type, the common flaws (correlation–causation, necessary vs. sufficient, ad hominem, and more), conditional-logic rules with contrapositives and quantifiers, argument structure, and Reading Comprehension strategy. Reflects the current format: the Logic Games (Analytical Reasoning) section was removed in 2024, so Logical Reasoning is now two of the three scored sections. Built to make the fundamentals automatic — not to replace timed practice on official PrepTests.

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Topics covered

Logical Reasoning Question Types

Must Be True, assumption, strengthen/weaken, flaw, method, parallel, principle, paradox & more

24 cards

Common Logical Flaws

Correlation–causation, necessary/sufficient, ad hominem, circular reasoning, straw man, sampling & more

28 cards

Conditional & Formal Logic

Sufficient vs. necessary, contrapositives, the unless rule, quantifiers, valid vs. invalid inferences

26 cards

Argument Structure

Premises, conclusions, sub-conclusions, assumptions, indicator words & finding the gap

16 cards

Reading Comprehension

Main point, author attitude, passage structure, function questions & comparative passages

12 cards

Format & Strategy

Current section structure, 120–180 scoring, no-guessing-penalty, pacing & blind review

14 cards

Card format

Front

Concept, question stem, or logic rule

e.g. Necessary vs. sufficient assumption

Back

Concise explanation with how it applies on the LSAT

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Showing 20 of 120

Click any card to flip it. These are the real cards in the deck — same content you get on import.

#1Front

Must Be True (Inference) — what the stem looks like

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#1Back

“If the statements above are true, which one of the following must also be true?” Stay inside the stimulus — the correct answer is fully proven by the given facts. Do not bring in outside assumptions.

#2Front

Must Be True — the trap to avoid

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#2Back

Answers that are merely plausible, likely, or 'could be true.' If a fact in the stimulus doesn't lock the answer in, it's wrong. 'Must' means guaranteed, not reasonable.

#3Front

Most Strongly Supported

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#3Back

Like Must Be True but looser: the answer only needs to be the best-supported choice, not airtight. Pick the option the stimulus makes most likely, not one it merely permits.

#4Front

Main Conclusion (Main Point) — approach

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#4Back

“Which one most accurately expresses the main conclusion?” Find the single claim every other statement is offered to support. Use the 'why' test: the conclusion is what the premises answer 'why?' for.

#5Front

Necessary Assumption — what it asks

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#5Back

“The argument depends on / requires assuming which of the following?” The answer is something that must be true for the argument to hold up — not enough to prove the conclusion, just required by it.

#6Front

Sufficient Assumption (Justify) — what it asks

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#6Back

“Which one, if assumed, allows the conclusion to be properly drawn?” The answer plugs the gap so completely that the conclusion follows with certainty. It can be stronger than strictly necessary.

#7Front

Strengthen — what the right answer does

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#7Back

“Which one, if true, most strengthens the argument?” Add support: affirm the assumption, close the premise–conclusion gap, or rule out an alternative explanation. The answer need not prove the conclusion, only help it.

#8Front

Weaken — what the right answer does

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#8Back

“Which one, if true, most undermines / casts the most doubt?” Attack the assumption or supply an alternative explanation. The answer doesn't have to disprove the conclusion, only make it less likely.

#9Front

Flaw in the Reasoning

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#9Back

“The argument is vulnerable to criticism on the grounds that it...” Name the logical error in the abstract (e.g., 'takes a necessary condition to be sufficient,' 'mistakes correlation for causation'). Learn the standard flaw descriptions.

#10Front

Method of Reasoning (Argument Method)

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#10Back

“The argument proceeds by...” Describe HOW the argument is built, not whether it's good: e.g., 'offers a counterexample,' 'draws an analogy,' 'rules out alternatives.' Match the abstract description to what the author did.

#11Front

Role / Function of a Statement (Argument Part)

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#11Back

“The claim that X plays which role in the argument?” Decide whether the referenced sentence is the main conclusion, a premise, a sub-conclusion, or background. Locate the main conclusion first, then place the claim relative to it.

#12Front

Parallel Reasoning

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#12Back

“Which argument is most similar in its reasoning?” Match the logical STRUCTURE — conclusion type, conditional pattern, validity — not the topic. Strip out the subject matter and compare the skeletons.

#13Front

Parallel Flaw

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#13Back

Match an argument that contains the SAME logical error. First identify the flaw in the stimulus, then find the answer that commits exactly that error — not just any bad argument.

#14Front

Principle — Identify vs. Apply

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#14Back

Identify: find the broad rule the specific argument conforms to. Apply: take a stated rule and use it to judge a particular case. Principle questions often behave like Strengthen or Must Be True questions in disguise.

#15Front

Resolve the Paradox / Discrepancy

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#15Back

“Which one most helps to resolve the apparent discrepancy?” Find a new fact that lets BOTH surprising statements be true at once. The right answer explains, never contradicts, either side of the puzzle.

#16Front

Point at Issue (Disagreement)

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#16Back

“X and Y disagree over whether...” The answer must be a claim that one speaker would affirm and the other deny — both must have an opinion on it. Run the 'agree/disagree test' on each choice.

#17Front

Evaluate the Argument

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#17Back

“Which question would be most useful to answer in evaluating the argument?” The right answer is a question whose two possible answers push the argument in opposite directions (the Variance Test).

#18Front

Cannot Be True

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#18Back

Find the answer that is impossible given the stimulus — the one that directly conflicts with or is ruled out by the stated facts. It's the mirror image of Must Be True.

#19Front

Conform to a Principle / 'Most Closely Conforms'

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#19Back

Treat the stated principle as a rule and find the situation or judgment it best supports. The correct answer is licensed by the principle; wrong answers go beyond or against it.

#20Front

Stimulus structure: Stimulus → Question stem → 5 answers

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#20Back

Read the stimulus first, identify conclusion and premises, anticipate the gap, THEN read the stem and prephrase an answer before looking at the choices. Reading the stem first wastes time on facts you must reread anyway.

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Who is this deck for?

· Pre-law students preparing for the LSAT
· Self-studiers who want to drill question types and flaw patterns with spaced repetition
· Anyone retaking the LSAT who wants the logic fundamentals to become automatic
· Students supplementing a prep course (PowerScore, 7Sage, Manhattan, Blueprint) with active recall

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MintDeck’s FSRS spaced repetition resurfaces each question type, flaw pattern, and conditional-logic rule right before you’d forget it — so the fundamentals are automatic by the time you sit the LSAT.

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This deck is provided for educational purposes only and is not affiliated with or endorsed by the Law School Admission Council. The LSAT is a skills-based reasoning test — flashcards reinforce question types, flaws, and logic fundamentals but are not a substitute for timed practice with official LSAT PrepTests. LSAT® is a registered trademark of the Law School Admission Council (LSAC), which does not endorse this product.