Two circuits of the same kind have a failure-to-open on-demand probability of 0.02. They are placed in parallel so that both must fail for system failure. What is the probability of system failure if failures are independent? What is the probability of system failure if the probability of a second failure is 0.1 given the failure of the first? For part a, what is the probability of one or more circuit failures? For part b, what is the probability of one or more circuit failures?