1. princeton上一道：m为奇数, m is not a perfect square, 其中perfect square是什么意思呀？
2. high-gmat上一道：if X and Y are sets of integers, X # Y denotes the set of integers that belong to set X or set Y, but not both. if X consists of 10 integers, Y consists of 18 integers, and 6 of the integers are in both X and Y, the X # Y consists of how many integers? 答案有：6 16 22 30 174
我选22，可答案为16，为什么？作者: joywzy 时间: 2003-2-28 11:24 标题: to sherry
1,完全平方数
2,是你粗心了,呵呵,怎么跟我一样啊?
, X # Y denotes the set of integers that belong to set X or set Y, but not both. 22-6=16.作者: joywzy 时间: 2003-2-28 11:27
