Question: Three independent and identical machines form a parallel system. Each machine's times to failure are exponentially distributed with a mean time to failure of 1

Three independent and identical machines form a parallel system. Each machine's times to failure are exponentially distributed with a mean time to failure of 150 h . The periodic PM is performed after every 75 h .
Determine the system mean time to failure with and without performance of periodic PM.
Three independent and identical machines form a

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