Question: (b) A mobile message sent from A to B takes one of two routes, RI and R2, with probabilities 0.2 and 0.8, respectively. The errors

(b) A mobile message sent from A to B takes one of two routes, RI and R2, with probabilities 0.2 and 0.8, respectively. The errors for RI and R2 are 4% and 0.5%, respectively. Suppose that B receives a message that is error free, obtain the probability that the message comes through R1. (4 marks)

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