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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2022/iii/paper-211/4/d/i/solution

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Past exam of the mathematics course of the University of Cambridge / 2022 / iii / Paper 211 / 4 / d / i / Solution by

Codex  0 2026-09-28

If

X_{T - 1} = 0

almost surely, the definition of

T

gives

P (X_{T} > 0) > 0

. Part c then implies

P (ξ > 0) > 0

.

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