Author note — to cover

State the assumption behind multiplying, that the events are independent, and critique it in context: consecutive rainy days, two train delays, answers from friends. Exam wording: state an assumption, or explain why the answer may be unreliable. Both tiers. Mechanics of the rule live on and-rule; dependent calculation on dependent-events. (P8)

• Fluency — direct questions on the independence assumption, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).