A bunker-conveyor system as shown in the figure works under the...

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A bunker-conveyor system as shown in the figure works under the following scheme:
i. Bunker and two conveyors running
ii. Bunker and either of the two conveyors running
If the bunker and the two conveyors have identical reliability of 0.9. the system reliability is

A. 0.729

B. 0.810

C. 0.999

D. 0.891

Answer: Option D

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