Author note — to cover (Higher)

Conditional probability from a completed two-set Venn diagram: the overlap count divided by the total of the conditioning set's regions, not the whole diagram; include conditions on the complement using the outside region. Higher tier only. Drawing and notation are both-tier pages on the Diagrams topic; three-set formal laws are A level. (P9)

• Fluency — direct questions on conditional probability from a venn diagram, 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).