5. A system is scheduled for preventive maintenance at times to, 2to, 3to,.... The failure time distribution of the original system is given by fr(t): B B-1 t -->{-} = exp (a) Find the reliability of the maintained system. 8,0> 0, t > 0. (b) Find the expected number of preventive maintenance to be performed before the oc- currence of a system failure.

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