Question: A documentary film-crew have been filming some animals in Antarctica during the Summer. They also wish to get footage of the animals in the winter, but they are unable to stay. They decide to set up some infrared cameras with some long lasting batteries when they leave. They have two cameras, two batteries and two animal sensors. However, the extreme cold of the Antarctic winter means that the reliability of the cameras, batteries and animal sensors is quite low. The reliability each camera is 0.71, the reliability of each battery is 0.77, and the reliability of each sensor is 0.62. What is the reliability of the system if it is set up using high level redundancy? What is the reliability of the system if it is set up using low level redundancy?

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