Exercise 13.2.3 Define Zn %n i=1 Xi , n 1, where X1, X2, . . .

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Exercise 13.2.3 Define Zn ≡%n i=1 Xi , n ≥ 1, where X1, X2, . . . , are independent random variables with E[ Xi ] = 1. Prove that { Zn } is a martingale.

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