Synopsis The essay is about a mathematical problem concerning probabilities and the reasoning process of how it is solved.The story of a retired railroad engineer who had insomnia is simply a method of making the problem-solving more interesting.There is an example to help make the essay more easily understood. When both you and your friend wanted to watch an exciting football match but had only one ticket,how did you two make the decision on who should go?Maybe you would take a coin and toss it,while asking your friend to guess which side would turn up.When the coin fell on the ground and the side he had guessed turned up,the ticket would belong to him;otherwise, you would get it.Synopsis The essay is about a mathematical problem concerning probabilities and the reasoning process of how it is solved. The story of a retired railroad engineer who had insomnia is simply a method of making the problem-solving more interesting. There is an example to help make the essay more easily understood. When both you and your friend wanted to watch an exciting football match but had only one ticket, how did you two make the decision on who should go? Maybe you would take a coin and toss it, while asking your friend to guess which side would turn up. When the coin fell on the ground and the side he had guessed turned up, the ticket would belong to him;otherwise, you would get it