**Probability Tree Diagrams - Math is Fun**
https://www.mathsisfun.com/data/probability-tree-diagrams.html

WEBProbability Tree Diagrams. Calculating probabilities can be hard, sometimes we add them, sometimes we multiply them, and often it is hard to figure out what to do ... tree diagrams to the rescue! Here is a tree diagram for the toss of a coin: There are two "branches" (Heads and Tails) The probability of each branch is written on the branch.

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