Question: A system has 3 components for the primary unit and a parallel backup unit: The primary unit has components A, B and C, where component

A system has 3 components for the primary unit and a parallel backup unit: The primary unit has components A, B and C, where component A has reliability of .99. Component B has reliability of .80. Component C has reliability of 90. The parallel backup unit also has Components A, B and C with reliability of 7..6 and 5, respectively. If the primary unit fails the backup unit will engage. What is the overall reliability of the system, A. .855 B. .713 C. 57 D. Between 9 and .93 E. Between 76 and .80
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