Consider the following portion of an electric circuit with three relays. Current will flow from point a to point b if there is at least one closed path when the relays are activated. The relays may malfunction and not close when activated. Suppose that the relays act independently of one another and close properly when activated with probability 0.9. a 3 4 b (a) What is the probability that current flows when the relays are activated? (b) Given that current does not flow when the relays are activated, what is the probability that relay 1 has malfunctioned?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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Consider the following portion of an electric circuit with three relays. Current will flow from
point a to point b if there is at least one closed path when the relays are activated. The relays
may malfunction and not close when activated. Suppose that the relays act independently
of one another and close properly when activated with probability 0.9.
a
(3)
4
b
(a) What is the probability that current flows when the relays are activated?
(b) Given that current does not flow when the relays are activated, what is the probability
that relay 1 has malfunctioned?
Transcribed Image Text:Consider the following portion of an electric circuit with three relays. Current will flow from point a to point b if there is at least one closed path when the relays are activated. The relays may malfunction and not close when activated. Suppose that the relays act independently of one another and close properly when activated with probability 0.9. a (3) 4 b (a) What is the probability that current flows when the relays are activated? (b) Given that current does not flow when the relays are activated, what is the probability that relay 1 has malfunctioned?
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