Consider the system of components connected as in
Chapter 2, Problem 80(choose chapter or problem)
Consider the system of components connected as in theaccompanying picture. Components 1 and 2 are connectedin parallel, so that subsystem works iff either 1 or 2 works;since 3 and 4 are connected in series, that subsystem worksiff both 3 and 4 work. If components work independentlyof one another and P(component i works) = .9 for i = 1,2and = .8 for i = 3,4, calculate P(system works).
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer