Author note — to cover

Multiply the branch probabilities along one complete route for that outcome's probability, fraction and decimal answers; two-stage trees, with three stages leaning Higher. Single routes only: combining routes is adding-across-paths. Flag that unchanged second-stage branches assume independence, taught on the Combined events topic. Both tiers. (P8)

• Fluency — direct questions on multiplying along the branches, 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).