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9. Suppose components A1, A2, B1, 32 and C1 operate independently in the system shown below. Assume that all the components in the system start operating at the same time and a component does not work again once it fails. The probability of functioning for each component is 0.90. The entire system works if A1 or A2 works, and B1 or B: works, and C1 works. Find the probability that the entire system works. Show your reasoning