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Determining System Reliability with Parallel Components

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A system has three components in parallel with reliabilities 0.9, 0.7, and 0.5. System reliability is __.

A) 0.315
B) 0.700
C) 0.900
D) 0.985
E) 2.100

The correct answer is D) 0.985 but my calculations do not come up with this. This is from a chapter review and I would appreciate help.

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This solution explains how to calculate the system reliability.

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If R_1, R_2, R_3 denote the component reliabilities, then the system reliability of a parallel ...

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