# What is the probability two independent exponentially distributed random variables being greater than one another? [closed]

I have two exponentially distributed independent random variables A and B.

The expectations of $$A$$ and $$B$$ are $$2$$ and $$1$$ respectively

What is the probability that $$B > A$$?

## closed as off-topic by StubbornAtom, lulu, JMoravitz, Foobaz John, NChFeb 19 at 2:25

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• Have you written down the joint density? – ncmathsadist Feb 18 at 17:05
• I'm not sure how I would go about doing that, could you help? – joebloggs Feb 18 at 17:28
• Strange that this question appeared just before – Foobaz John Feb 18 at 17:37
• And this question also appeared recently. What is the source of this question? – lulu Feb 18 at 17:44