LSAT Logical Reasoning Study Guide: 96 Flashcards on Fallacies, Conditionals and Test Format
Master LSAT logical reasoning with 96 flashcards: assumptions, contrapositives, 14 named fallacies, scoring percentiles and the post-2024 test format.
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Memorize How the LSAT Works: Format, Scoring and 77 Exam Facts
Learn the LSAT inside out: the 120-180 scale, percentile anchors, section structure since logic games were removed in 2024, and 77 flashcards.
Most LSAT prep books drown you in 400 pages before you have memorized the vocabulary the test actually uses. The LSAT Logical Reasoning deck on Flip It (deck code BJ7127, 96 cards) takes the opposite route: it isolates the definitions, fallacy names, test-format facts and scoring numbers that recur in every logical reasoning question, and lets you drill them in a few sessions.
Study this deck: LSAT Logical Reasoning
1 / 10What is the LSAT?
Tap the card for the answer · swipe right if you knew it, left if not
Since August 2024 the LSAT has two logical reasoning sections (the logic games section was dropped after a 2019 ADA settlement), each with 24-26 questions in 35 minutes. That makes argument analysis roughly half of your scaled 120-180 score, so knowing the names of the moves matters.
A sample of the cards
| Front | Back |
|---|---|
| What is an assumption? | An unstated premise that must be true for the argument to be logically valid |
| What is the contrapositive? | If A→B, then not-B→not-A (negate and reverse) |
| What is a sufficient condition? | A condition that, if true, guarantees another is true (if A, then B) |
| What is the post hoc fallacy? | Assuming that because B followed A, A caused B |
| What is a sound argument? | A valid argument with true premises |
| What is parallel reasoning? | Finding an argument with the same logical structure as the original |
| What percentile is a score of 165? | Around the 90th percentile |
| How many times can you take the LSAT? | No more than 5 times in 5 years, 7 in a lifetime (since August 2023) |
| What is equivocation? | Using a word with multiple meanings in different ways within the same argument |
What the 96 cards cover
- Argument anatomy: premise, conclusion, assumption, inference, counterexample, burden of proof, valid vs. sound, validity vs. truth, deductive vs. inductive reasoning.
- Conditional logic: sufficient condition, necessary condition, conditional reasoning, contrapositive, causation vs. correlation.
- Question tasks: strengthen, weaken, parallel reasoning, identify the assumption, find the flaw.
- Fourteen named fallacies: formal fallacy, post hoc, circular reasoning, begging the question, ad hominem, straw man, false dilemma, appeal to authority, hasty generalization, equivocation, red herring, slippery slope.
- Test format and history: 1948 origin (Harvard, Yale, Columbia), 200-800 then 48-point scales, the 120-180 scale since 1991, experimental section, 50-minute unscored writing sample, comparative reading (2007), LSAT-Flex (2020-2022), digital delivery since 2019, US$238 fee, 9 administrations a year, scores valid 5 years.
- Score data: median around 150, 151 ≈ 50th percentile, 173 ≈ 99th, 178+ ≈ 99.9th; LSAT/first-year grades validity of .40-.41; highest average scores by major (Mathematics/Physics 164.3, Economics 161.7, Engineering 160.6).
Two ways to study this deck
1. Split it into two decks in your head. Cards 1-13 and 51-96 are format, scoring and history facts: pure memorization, one evening is enough. Cards 14-50 are the reasoning concepts, and those deserve a different treatment: after flipping each card, write one two-line argument that commits the fallacy or uses the structure. A hasty generalization you invented yourself is far harder to miss on test day than a definition you merely recognized.
2. Drill the conditional cards until they are reflexes. Sufficient, necessary and contrapositive make up the machinery behind most weaken/strengthen questions. Review those four cards first every session, then say the contrapositive of a random "if... then" sentence out loud before moving on. Under the 35-minute clock, you want "if A→B" to trigger "not-B→not-A" without conscious effort.
Study it on Flip It
Log in at flip-it.app, open the library and search for deck code BJ7127 ("LSAT Logical Reasoning"). Spaced repetition will bring the fallacies you confuse (begging the question vs. circular reasoning, red herring vs. straw man) back more often than the ones you already own.
Preparing for another admissions exam? See the MCAT test format and scoring flashcards or the GRE high-frequency word list.
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