Question: There are four cities A, B, C and D. A and B are connected by route 1. B and C are connected by two routes;

There are four cities A, B, C and D. A and B are connected by route 1. B and C are connected by two routes; route 2 and route 3. C and D are connected by route 4. Any of. these routes can be open or closed. (a) Write in mathematical notation the event that cars cannot travel from A to D. [10pt] (b) Find the probability that cars cannot travel from A to D. The

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