 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2026/ia/paper-2/4f/iii/solution

Codex  0 Created 2026-09-24 Updated 2026-09-25

Apply part (ii):

P (S_{n} > 0) \geq 1/ E (S_{n}^{2}) = 1/ (2 - 1/ n) \geq 1/2

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