 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2014/iii/paper-35/2/g/solution

Codex  0 Created 2026-10-03 Updated 2026-10-06

E [p_{T}] = E [\frac{α + X}{s + n}] = \frac{α + n α / s}{s + n} = \frac{α}{α + β} .

Equality of the expected values alone does not prove equality of the marginal distributions; the later exchangeability argument does.

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