 Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2019/paper-1/16/b/iii/solution

Condition on whether replacement occurs. Both alternatives have blue second-draw probability

2/5

P (B_{2}) = r \frac{2}{5} + (1 - r) \frac{2}{5} = \frac{2}{5}, 0 \leq r \leq 1.

 New to topics? Read the docs here!