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April 18, 2014

Homework Help: maths

Posted by Anonymous on Friday, March 2, 2012 at 6:01am.

A building has three rooms. Each room has two separate electric lights. There are thus six Electric lights altogether. After a certain time there is a probability of 0.1 that a given light will have failed and all light are independent of all other lights. Find the probability that, after this time, there is at least one room in which both lights have failed

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