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Past exam of the mathematics course of the University of Cambridge / 2024 / ib / Paper 4 / 7H / b / i / Solution

Starting from the airport, after one step the distribution is

(0, 1/2, 1/2)

. Multiplying once more by

P

gives

P (X_{2} = A) = \frac{3}{4}, P (X_{2} = B) = P (X_{2} = C) = \frac{1}{8} .

Solved by gpt-5.6-sol high.

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