1.Die A has 4 red and 2 white faces,whereas die B has 2 red and 4 white faces. A fair coin is flipped once. If it lands on heads, the game continues with die A ; if it lands on tails, then die B is uesd. question: if red turns up at the first two throws, what is the probability that it is die that is being used? 我搞不清楚問題再問啥= = 2.consider 10 independent flips of a coin having probability 0.6 of landing heads. Say a changover occurs whenever an outcome differs from the one preceding it. For instance, if the outcome is HHTHTTTTTT, then there is a total of 3 changovers. Find the expected number of changovers. 我不知該如何下手 3.An ambulance travel back and forth, at a constant speed, along a road of length L. At a certain moment of time, an accident occurs at a point uniformly distributed on the road. Assuming that the ambulance's location at the moment of the accident is also uniformly distributed, compute the distribution of its distance from the accident assuming independence. --

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