Probability Trees: Theory The basic idea of a probability tree is to use the properties of probability to make a branching diagram of different outcomes.

Tree diagrams are a way of showing combinations of two or more events. Each branch is labelled at the end with its outcome and the probability is written alongside the line.

GCSE Edexcel Probability - Edexcel Tree diagrams Probabilities can be written as fractions, decimals or percentages on a scale from 0 to 1. Knowing basic facts about equally likely outcomes can ...