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8. Suppose X1 and are X 2 are independent, exponential random variables, with parameters (11 and (1'2, respectively (a) Write down the joint density of

8. Suppose X1 and are X 2 are independent, exponential random variables, with parameters (11 and (1'2, respectively (a) Write down the joint density of {X1,X2). (b) Calculate (i) P{X1 > 3X2) and (ii) P{X1 2 X2)

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