ENGG -STATS

System A consists of a single ring with 100 stations, one per repeater. System B consists of four 25 stations rings linked by a bridge. If the probability of a link failure is , a repeater failure is , and a bridge failure is , derive an expression for parts (a) to (e). 50 points

a) Probability of failure of system A.

b) Probability of complete failure of system B.

c) Probability that a particular station will find the network unavailable, for systems A and B.

d) Probability that any two stations selected at random will be unable to communicate for systems A and B.

e)