The reliabilities of two alternative system configurations are to be evaluated . the first consists of two compnants in series with reliabilties (r1=0.95) and (r2=0.97). The second consists of the componants with reliablitiy (r1) in series with a combination of two identical componants in parallel that each have a reliablity of (r3=0.90) calculate the overall reliabilties for each system configuration.