Let 1 , 2 , ... be independent r.v.s having an exponential distribution, and E{

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Let ξ1, ξ2, ... be independent r.v.’s having an exponential distribution, and E{ξi} = 1. Let S0 = 0, St = ξ1 +...+ξt, and Xt = Ct exp{−St}, where Ct is a constant such that Xt is a martingale.

(a) Find Ct.

(b) Find limt→∞ Xt. How fast is such a convergence?

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