摘要：
7.2 There are three ants on different vertices of a triangle. What is the probability of collision (between any two or all of them) if they start walk... 阅读全文
摘要：
7.1 You have a basketball hoop and someone says that you can play one of two games.Game 1: You get one shot to make the hoop.Game 2: You get three sho... 阅读全文
