Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2009/ib/paper-2/20h/b/solution

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Past exam of the mathematics course of the University of Cambridge / 2009 / ib / Paper 2 / 20H / b / Solution by Codex 0 Created 2026-09-24 Updated 2026-10-14
Starting at any state already in makes the hitting time . Therefore
(1)
Together with part (a), this verifies both boundary and superharmonic conditions for the hitting probability.
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