一道概率题求解

幸运E枪兵 · 发表于 2012-7-27 16:40:38

What is the probability that a studentrandomly selected from a class of 60 students will be a male who has brownhair?
(1) One-half of the students have brown hair.
(2) One-third of the students are males.

A. Statement (1) ALONE issufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE issufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHERare sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE issufficient.
E. Statements (1) and (2) TOGETHERare NOT sufficient.
答案e

kellylsn · 发表于 2012-7-27 21:17:45

问男生中有brownhair的概率
1全班一半学生有brownhair
2三分之一的学生是男生
从1和2 中并不能知道男生中有多少人是brownhair 故E

一道概率题求解

所属分类: GMAT考试

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