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Unformatted text preview: and not a constant , show it must be exponential(l) for some l>0. Remark : In 9 you may not assume X to be a cts rv with some pdf. If F is the df then you must show 1F(x)=exp(lx) for x>0 . Since 1F is right continuous this will be the case if it's true for rational x's ....
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 Fall '09
 Addition, Probability, Summation, Borel Cantelli Lemma.

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