随便举个例子来说, 我的GWD1-2的题是这样的: Q2: A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster. If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?
A. 0 B. 1/9 C. 2/9 D. 1/3 E. 1 Answer: 而论坛链接里同题号的题是这样的: Q2: E 这题怎么做啊?完全没有思路的说 If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p > 1/2? (1) More than of the 10 employees are women. (2) The probability that both representatives selected will be men is less than 十分之一 难道这只是我一个人的问题么???? |