题目信息
Pablo plays 3 rounds of a game, in which his chances of winning each round are$$\frac{1}{3} ,\frac{1}{6} , and\frac{1}{n}$$ , respectively. If$$ n \neq 0$$, what is the probability that Pablo wins the first two rounds, but loses the third?
A:$$\frac{1}{18n}$$
B:$$\frac{n-1}{18n}$$
C:$$\frac{1}{2n}$$
D:$$\frac{n+2}{2n}$$
E:$$\frac{3n-2}{2n}$$
参考答案及共享解析

共享解析来源为网络权威资源、GMAT高分考生等; 如有疑问,欢迎在评论区提问与讨论
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已选答案:
正确答案:
B:$$\frac{n-1}{18n}$$
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题目来源
Manhattan