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Question: a device consists of two redundant subunits only one needs...

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A device consists of two redundant subunits; only one needs to be working for the device to function. The first subunit has two parts Wi and W2, and the second has two parts Ws and Ws. In identical and equally reliable, with probability p-09of fuctoning. (a) What is the overall probability the device functions correctly? (b) Suppose you have available two ultra-reliable parts, each with p 0.99 of working. 2. Which two parts in the device should you replace with these in order to maximize device reliability? Justify your answer by calculating the resulting reliability and explain your choice
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