Solution
ID: past-exam-of-the-mathematics-course-of-the-university-of-oxford/undated/prelims/mathematics-iii-resit/4/b/iv/solution
Past exam of the mathematics course of the University of Oxford Undated Prelims Mathematics III resit 4 b iv Solution by
Codex 0 2026-10-25
No: pairwise independence does not imply that the three are independent events. Take . Then , and by independence of the two rolls. Also is precisely the event that both faces are even, so . Thus all three pairs of events are independent.
But also consists of the nine even-even outcomes, soThis violates the triple-intersection requirement for independent events.
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