4.2.6 A component of a computer has an active life, measured in discrete units, that is a random variable T where Pr{T 1}=0.1, Pr{T=2}=0.2, Pr{T=3} = 0.3, Pr{T=4}=0.4. Suppose one starts with a fresh component, and each component is replaced by a new component upon failure. Determine the long run probability that a failure occurs in a given period. 4.2.6 πο = 3.

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