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An engineer designs a system with two components, A and B . Both A and B have a backup of identical reliability, and both A

An engineer designs a system with two components, A and B

.

Both A and B have a backup of identical reliability, and both A and B work in series for the entire system to operate. If the overall system reliability must be at least

0.8,

what is the least reliable component B that can be used if component A has a reliability of

0.7 ?

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