Probability tree 2: How to calculate new probabilities (Bare bones theory)

This is for my L2MAS class.
2.12 Probability methods (NCEWA AS91267)
Probability tree 2: How to calculate new probabilities (Bare bones theory)
Probability tree 2: How to calculate new probabilities (Bare bones theory)
Probability tree 2: How to calculate new probabilities (Bare bones theory)

theory)