Question: A device contains two circuits. The second circuit is a backup for the first, so the second circuit is only used only when the first

A device contains two circuits. The second circuit is a backup for the first, so the second circuit is only used only when the first has failed. The device fails when and only when the second circuit fails. Let X and Y be the times at which the first and second circuits fail, respectively. X and Y have joint probability density function 6 2e-3, 0
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