Author note — to cover

Multiply probabilities of independent events for both-happen questions, two or three events, fraction and decimal answers, noting the product is smaller than either factor. Always state the independence condition. Both tiers. Exclude dependent events (dependent-events page), tree-diagram layout (Diagrams topic) and at-least-one questions (sibling page). (P8)

• Fluency — direct questions on the and rule for independent events, 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).