Specifications for a power unit consisting of three independent and serially related components(failure modes) requires a design life of 5 years with a 0.95 reliability. (a) let each component have a constant failure rate such that the first component's rate is twice that of the second and the third component;s rate is three time that of the second. what should be the MTTF of each component and the system? (b) If two identical power units are placed in parallel, what is the system reliability at 5 year and what is the system MTTF?