Question

A green wave occurs when a series of traffic lights (usually three or more) are coordinated to allow continuous traffic flow over several intersections in one main direction (Wikipedia). A frustrated driver thinks that the traffic lights system in his neighborhood, consisting of three traffic lights, is not working correctly. The driver's examination revealed that the probability of having no red light on his way to work is 0.4, the probability of having one red light is 0.1, and the probability of having two red lights is 0.2. Find the probabilities of the following events
? : Having at least one red light.
? : Having at least one green light.
? : Having odd number of red lights.
? : Having one green light at most

Answer 1