题目信息
A certain club has 10 members, including Harry. One of the 10 members is to be chosen at random to be the president, one of the remaining 9 members is to be chosen at random to be the secretary, and one of the remaining 8 members is to be chosen at random to be the treasurer. What is the probability that Harry will be either the member chosen to be the secretary or the member chosen to be the treasurer?
A:$$\frac{1}{720}$$
B:$$\frac{1}{80}$$
C:$$\frac{1}{10}$$
D:$$\frac{1}{9}$$
E:$$\frac{1}{5}$$
参考答案及共享解析
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已选答案：
正确答案：
E:$$\frac{1}{5}$$
*考点：概率
*解析：
10人中Harry成为secretary的概率为1/10, 同理，他成为treasurer的概率也是1/10。所以either的概率为：1/10 + 1/10 = 1/5,选E
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