A computer requiring high reliability has 4 independent components, and functions as long as at least 1 of the components functions. The time-to-failure of each of the components has an exponential distribution with parameter 1. Starting with 4 new working components, what is the expected time to failure of the computer (that is, time till all 4 components have failed)? 25/12 4 12/5 None of the choices.

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