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标题: POSSIBILITY GWD-07-2 [打印本页]

作者: wangtsong 时间: 2007-12-16 15:23
标题: POSSIBILITY GWD-07-2

Q2:

If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p > ?

(1) More than of the 10 employees are women.

(2) The probability that both representatives selected will be men is less than .

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient

ANS: E

作者: wangtsong 时间: 2007-12-16 15:24

请教这道概率题怎么做啊？

作者: justsuperfro 时间: 2007-12-16 20:24

your question is not completed.

If 2 different representatives are to be selected at random from a group of 10 employees and if p is the probability that both representatives selected will be women, is p > 1/2?

(1) More than 1/2
of the 10 employees are women.

(2) The probability that both representatives selected will be men is less than 1/10.

1. p> 5*4/10*9

2. x= the number of female

(10-x)(9-x)less than 9

x could be 8 or 7

if x=8 P> 1/2

if x=7 Pless than 1/2

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