1. All arguments contain at least one premise. A premise is information used by the author to support some claim or conclusion. That information information may be a fact or an opinion. In the above example, sentence 3 is a premise because it helps to support the author's conclusion.Manhattan Prep Publishing. GMAT Critical Reasoning (Manhattan Prep GMAT Strategy Guides Book 6) (p. 21). Manhattan Prep Publishing. Kindle 版本. Manhattan Prep Publishing. GMAT Critical Reasoning (Manhattan Prep GMAT Strategy Guides Book 6) (p. 21). Manhattan Prep Publishing. Kindle 版本.