曼哈顿DS数学题求助~

哦所以呢 · 发表于 2017-9-19 13:43:24

8 cities, including Memphis, are finalists to be chosen to host a political convention. Exactly one city will be chosen to host the convention. What is the probability that Memphis is not chosen?

(1) The probability that any one of the 8 cities does not win the competition is 7/8.

(2) The probability that Memphis wins the competition is 1/8.

AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
DEACH statement ALONE is sufficient.
EStatements (1) and (2) TOGETHER are NOT sufficient.

正确答案: D

不理解为什么（1）正确，感觉和题干（Exactly one city will be chosen to host the convention.）矛盾。

谢谢各位啦~

[原始] 曼哈顿DS数学题求助~

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