21. The lifetimes of mufflers manufactured by company A are random with the following probability density function:

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21. The lifetimes of mufflers manufactured by company A are random with the following probability density function:

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The lifetimes of mufflers manufactured by company B are random with the following probability density function:

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Elizabeth buys two mufflers, one from company A and the other one from company B and installs them on her cars at the same time. What is the probability that the muffler of company B outlasts that of company A?

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