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A system consisting of four components is said to work whenever both at least one of...

A system consisting of four components is said to work whenever both at least one of components 1 and 2 work and at least one of components 3 and 4 work. Suppose that component ? alternates between working and being failed in accordance with a nonlattice alternating renewal process with distributions ?? and ??,?=1,2,3,4. If these alternating renewal processes are independent, find lim?→∞=?{system is working at time ?}.

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