Probability of each outcome

You just multiply your way down the probability tree! Do you recognize the multiplication law in here?

P(A1,G)=P(A1?G)=P(A1)*P(G?A1)=.65*.98=.6370

Likewise you can calculate:

P(A1,B)=.65*.02=.0130

P(A2,G)=.35*.95=.3325

P(A2,B)=.35*.05=.0175

These are all prior probabilities.

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