Question: 10. There are two roads from points A to B and two roads from B to C. Each of the four roads has a 50%%

10. There are two roads from points A to B and two roads from B to C. Each of the four roads has a 50%% chance of being blocked due to an accident, independently of the others. [a) What is the probability that there is an open road from A to C? [b) Now suppose that there is also a direct road from A to C which is independently blocked with the same probability as the roads from A to B and B to C, what is the probability that there is an open road from A to C

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