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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 1-F(x)=exp(-lx) for x>0 . Since 1-F is right continuous this will be the case if it's true for rational x's ....

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