Category: Logical Reasoning

Should You Diagram LSAT Logical Reasoning?

I interviewed Stephen Harris, former LSAT question-writer who has written hundreds of the questions that appear in your books of LSAT PrepTests. Watch a related lesson How to Destroy LSAT…
Read Question Stem or Stimulus First?

Read the question stem first. Stephen Harris, a former LSAT question writer who's written hundreds of the questions in your PrepTest books, puts it bluntly below: "Always, always, always read…
Necessary Assumption Questions, Negation Test, and Must Be True Qs

The negation test checks whether an LSAT answer choice is a necessary assumption: negate the choice, and if the argument falls apart, that's the correct answer. Necessary assumption questions work…
Sufficient Assumption Questions and the Negation Test

No, the negation test doesn't work for sufficient assumption questions. It's built for necessary assumption questions, where the correct answer must be true for the argument to work. A sufficient…
LSAT Logical Reasoning Flaws, Fallacies List

LSAT Logical Reasoning questions often hide a classic logical fallacy inside stimulus language specific to that argument's topic, rather than naming the flaw outright. This page lists the fallacies that…
LSAT Logic of a Spam Email Scam
LSAT Logic and Law School Spam

I hate spam. I even wrote an article making fun of spammers. I send emails on a schedule and sent out automatically- and that’s only if you’ve chosen to subscribe via email.…
Conditional Reasoning: Contrapositive, Mistaken Reversal, Mistaken Negation

The contrapositive flips and negates both sides of a conditional statement, and it's always logically equivalent to the original. A mistaken reversal swaps the sufficient and necessary conditions without negating…
Logical Reasoning | Formal Logic Inference Questions

My students know I’m not a fan of diagramming most Logical Reasoning questions. However, some questions just beg to be diagrammed. These questions tend to be formal logic inference questions…
LSAT Numbers: All, Most, Several, Many, Some, None

On the LSAT, "all" means 100% and "none" means 0%, no exceptions. "Most," "several," "many," and "some" are ranges, and every one of them leaves room for the real number…