tt-1-2,7,8,9,10,24,30

顾风 · 发表于 2006-7-11 09:45:00

以下是引用allen0018在2006-7-10 23:51:00的发言：

Q24:

If w and c are integers, is w > 0?

(1) w + c > 50

(2) c > 48

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.

e

我想问大家不等式同向加减的知识点

当然不能确定, when c= 100时 w>-50

when c = 49时， w>1

so, choose e

windlove · 发表于 2006-8-27 10:05:00

to Q9.

4 rosebushes, so the total possibility is Permutation(4,4), ie, there are 24 possible outcomes to order the place of them,

then for the red rosebushes in the middle, there are two outcomes as r1 r2 or r2 r1 in the middel of the place, and for the white ones, there are two outcomes as well, ie, w1 r r w2, w2 r r w1 , so the numerator should be 2*2, and denominator should be 24. 4/24=1/6

yaoyao99 · 发表于 2006-8-27 12:07:00

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=184062&page=1

hollycheng · 发表于 2006-12-1 03:05:00

以下是引用allen0018在2006-7-10 23:46:00的发言：

Q9:

A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?

A. 1/12

B. 1/6

C. 1/5

D. 1/3

E. 1/2 key:b

我选的是d

我怀疑这2个白花布一样？

我是c1-3; 答案怎么来的？

是这样做的，不要用组合

a,b,b,a; a,b,a,b; a,a,b,b;

b,a,a,b;b,a,b,a; b,b,a,a;所以是 b，understand?

但是如果将两个红rosebushes作为个整体来看，这两个放在中间的可能性不就是1/3了吗？不知怎么解

不喝水的鱼 · 发表于 2006-12-20 18:31:00

楼上MM没有看清楚哦？

wanghan114 · 发表于 2007-7-23 21:34:00

怎么没有第7题？？？

ukyo · 发表于 2008-1-1 03:05:00

关于Q9可以把红房看成a1 a2白房是b1 和b2那么就可以有4可能在中间b1 a1 a2 b2;b2 a1 a2 b1;b1 a2 a1 b2;b2 a2 a1 b1;
由于随机选择所以总共24种可能，4/24这是我的理解

xlyun · 发表于 2008-2-25 00:27:00

我和十七楼这种思路差不多.嘿嘿,我认为是,先全排列A44=24因为两个RR相同两个WW相同,所以要除二,即12种不同的排法,而中间是两个RR的不同种排法有2种,所以概率为2\12=1\6

Amber789 · 发表于 2008-7-15 06:56:00

以下是引用allen0018在2006-7-10 23:46:00的发言：

Q9:

A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?

A. 1/12

B. 1/6

C. 1/5

D. 1/3

E. 1/2 key:b

我选的是d

我怀疑这2个白花布一样？

我是c1-3; 答案怎么来的？

(p22*p22)/p44=4/24=1/6

perrier · 发表于 2009-5-24 11:48:00

以下是引用allen0018在2006-7-10 23:46:00的发言：

Q9:

A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?

A. 1/12

B. 1/6

C. 1/5

D. 1/3

E. 1/2 key:b

我选的是d

我怀疑这2个白花布一样？

我是c1-3; 答案怎么来的？

我的解题方法:

第一朵取到白色的概率:2/4

第二朵取到红色的概率:2/3

第三朵取到红色的概率:1/2

第四朵取到白色的概率:1(条件概率)

四者相乘=1/6

tt-1-2,7,8,9,10,24,30

所属分类: GMAT考试

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