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Logical Reasoning — Assumption Questions
Assumption (Necessary and Sufficient) questions are the most common LR item type.
What you need to know
1Necessary Assumption: what MUST be true for the argument to work — use the negation test
2Sufficient Assumption: what, if added, GUARANTEES the conclusion
3Both types require isolating the conclusion from the premises first
4Combined, Assumption items represent ~25% of the entire LSAT
Average score improves 8–12 points with structured logical reasoning practice
About the LSAT
- Full name
- Law School Admission Test
- Passing score
- 170+ for T14 law schools (99th percentile)
- Questions in bank
- 2,200+
Logical Reasoning — Assumption Questions — AI Practice Questions
2,200+ questions. Instant AI explanations for every wrong answer. Adaptive difficulty that targets your weak spots.
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Other LSAT Topics
Logic Games — Linear Sequencing
Study →The most trainable LSAT section — diagramming skill determines score more than reasoning.
Reading Comprehension — Comparative Passages
Study →Paired passages testing the relationship between two authors' arguments.
Logical Reasoning — Weaken & Strengthen
Study →Together ~25% of all LR items. Attack or support the link between premises and conclusion.