6.13 A subassembly is composed of two components, component A and component B, which operate in series and have constant failure rates in failures per year. Find the system reliability at the end of the tenth year and the system MTTF for each configuration described below: (a) The subassembly as depicted (b) Two subassemblies operating in parallel (high-level active redundancy with 2 "A-B's") (c) One subassembly configured in low-level active redundancy with 2 "A's" and 2 "B's" (d) Four identical subassemblies operating as a 2 out of 4 redundant system (k-out-of- n ) (e) Two identical subassemblies configured as a standby system with standby component A and B failure rates of .005 and .003 respectively (f) Two identical subassemblies operating as a load-sharing system -with shared-load component failure rates of .023 and .012 (components. A and B respectively)