Author note — to cover

Find every route satisfying an event, exactly one head, different colours, at least one six, then add the route products; cross-reference the complement shortcut for at-least-one (Combined events). Two-stage trees at Foundation, three-stage leaning Higher. Both tiers. Exclude given-that readings of a tree, which are Higher (Combined events). (P8)

Introduction

—coming soon—

Practice and continue

Practice

Adding across the paths

Finding every path that satisfies the event, then adding their probabilities.

Next lesson

Tree diagrams without replacement

Second-stage branches recalculated after the first pick, never simply copied.