Question: 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.

  1. 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 Pl, a repeater failure is Pr , and a bridge failure is Pb , derive an expression for parts (a) to (e). 50 points

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