Probability tree diagrams make answering probability questions much easier. Make sure you can draw tree diagrams.

**Key facts**

**Multiply**the numbers along the branches to get end results- The numbers on any set of branches that meet at a point must always
**add**up to 1 **Check**your diagram is correct by checking that the end results**add**up to 1- To answer a question,
**add**up the**relevant end results**

Probability revision questions

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