Question: 3. Consider the network shown in Figure that interconnects nodes A and B. The switches S1, S2, S3, and S4 have availabilities A1, A2, A3

3. Consider the network shown in Figure that interconnects nodes A and B. The switches S1, S2, S3, and S4 have availabilities A1, A2, A3 and A4, respectively. That is, the probability that switch Si is operational at any given time is Ai, i = 1, 2, 3, 4. If the switches fail independently, what is the probability that at a randomly selected time A can communicate with B (that is, at least one path can be established between A and B)

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