If you want to score well on the LSAT, you must understand the contrapositive. It’s one of the most frequently tested logical tools, and once you fully internalize it, conditional reasoning becomes far more predictable—even easy.
What Is the Contrapositive?
A contrapositive is the logically equivalent version of a conditional statement. To form it, you do two things:
- Flip the order of the terms
- Negate both sides
The original statement and its contrapositive have the same truth value and the same meaning in logic. They are perfectly interchangeable on the LSAT.
Why It Matters
The LSAT regularly hides the contrapositive inside:
- Must Be True questions
- Sufficient Assumption questions
- Parallel Reasoning questions
- Flaw questions
