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The number of years the laptop functions is exponentially distributed with mean = 5 years. If a customer purchased an old laptop which was used for last two years, what is the probability that it will function for at least 3 years?

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    Duplicate of [Memorylessness of the Exponential Distribution](http://math.stackexchange.com/q/354480/77033)2014-03-11

2 Answers 2