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Let Xn = Pn j=1 Bej∆Bej . Derive an expression for E[Xn], and hence state whether {Xn} is a martingale with respect to the filtration of Ben.

Let Xn Pn j1 BejBej Derive an expression for EXn and hence state whether Xn is a martingale with respect to the filtration of Ben class=

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