Probability

Chance, outcomes and combined events — from a single coin flip to tree diagrams and Venn diagrams.

Basic Probability

Express the likelihood of an event as a fraction, decimal or percentage, and use the probability scale confidently.

Combined Events & Tree Diagrams

Find the probability of two or more events happening by listing outcomes or drawing a tree diagram.

Venn Diagrams & Set Notation

Use overlapping circles to organise events, read off probabilities, and get to grips with union and intersection symbols.

Conditional Probability

Work out the probability of an event when you already know something else has happened — including without-replacement problems.