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我今天刚做了一套GWD的数学题，有两道题目没有搞明白，请各位帮忙解答，谢谢！ Q2: 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 1/2 of the 10 employees are women. (2) The probability that both representatives selected will be men is less than 1/10 参考答案选E，但是我选了B。思路如下：由条件1不能解题，但是由条件2可以计算到men的数量小于等于3，所以P肯定大于2. 是不是我的算法有问题？为什么选E？
Q15: Which of the following fractions has a decimal equivalent that is a terminating decimal？ A.10/189, B.15/196, C.16/225, D.25/144, E.39/182 答案选E，但是要算很久才算出来，很费时间，请问各位有没有好的办法可以做得快一点？谢谢！ | 
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发表于 2008-10-2 17:46:00
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