Question: A complex machine is able to operate effectively as long as at least 3 of its 5 motors are functioning. If each motor independently functions

A complex machine is able to operate effectively as long as at least 3 of its 5 motors are functioning. If each motor independently functions for a random amount of time with density function f (x) = xe−x, x > 0, compute the density function of the length of time that the machine functions.

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