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Two bulbs vs one bulb

Posted on: February 14th, 2013 by
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Suppose the life-time of a light bulb of type A is an exponential RV with mean 1 month, and that of type B is exponential with mean 2 months. Is it better to have 2 bulbs of type A or 1 bulb of type B? Come up with the answer without doing the math.

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