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?
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A$$\frac{1}{18n}$$
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B$$\frac{n-1}{18n}$$
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C$$\frac{1}{2n}$$
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D$$\frac{n+2}{2n}$$
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E$$\frac{3n-2}{2n}$$
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正确答案: B