Peter has bag containing 5 beads. 1 of them is red and the other 4 are blue.
He pulls out a bead, records a colour and returns it to the bad. He then pulls out another bead and records this second colour.
Below is a tree diagram showing the different possibilities.
For example, the first branch represents Red on his first pull out, followed by another red.
The fractions represent the probability of a red token (1/5) and a blue token (4/5)
Underneath the tree diagram are examples of various different calculations
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