 Solution

ID: past-exam-of-the-year-1-of-the-computer-science-course-of-the-university-of-oxford/2023/discrete-mathematics-probability-and-continuous-mathematics/7/b/i/solution

The first exchange removes one red ball from urn 1 and replaces it with a blue ball. Hence $R_{1} = n - 1$ with probability one.

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