Let S, n0 denote a random walk for which =E[SS] = 0. Let, for A > 0,
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Let S, n0 denote a random walk for which =E[SS] = 0.
Let, for A > 0, B > 0, N = min{n S, A or S, -B}. Show that E[N] AB} > 0. Then show that E[N] KE[G], where G is an appropriately defined geometric random variable.)
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