昨日北美(转自Robert之家)

2002-12-23 22:14:57

Maths: 4* (~90% ) Verbal 3* (5*%) Total 8*%

This Mark is out of my expectation and it's not very satisfactory. However, Only decided to take GMAT 1.5 half month ago and only use 2-3 hours per day for the test preparation, I can't really expect more. Although I have took TOEFL and GRE CAT before with 95%+ Scores, This GMAt seems more difficult than any of the other two tests.. Sigh.. And one thing to mention is that I have been in North America for more than 4 years from now and took english courses quite often.

MATH: I have benefit a lot although the score is not really good, Coz I didn't control the pace well, I check randomly for last 3 questions.( And even worse, I mistakenly Answered \\"不报成绩\\" for last question.) So, Pace is really important for Math. I have been good on Question No1-18 with half the questions left. And the first part was pretty difficult with 2-3 probability Questions.) But I didn't do well in the second part, especially the last 5 minutes.) And There are a lot of JJ.

Trust me, work on the most latest Math JJ and you will benefit a lot from that.

67. 圆A，B，C。问圆A面积是不是大于圆B
1)圆A，B面积都大于圆C
2)圆B，C，coincide in the center
我选E
[讨论]E。

2. 有个充分必要题目：triangle
with one side of 5 and one side of 15
（1） the circumferance is the triangle is the product of 5
（2）**
I choose A

3. point (a,b) in Line X, 有一线平行于X=Y，不在II象限which of the following must be true value of a and b;

A) aB) a=b
C) a>b
D) It accept secion I, IV
E) it Accept secion III

I chose C

21. 一个数列的前n项和是n(n+1)/2, 求99到301之间所有偶数的和。
[确认]20,200
[思路]等差数列求和：A1=100，An=300，注意99-301之间所有偶数有101个，即n=101。Sn=101*(100+300)/2

48. 车在高速路上的平均速度为50，问全程的平均速度
（1）路程总长为150
（2）在非高速路上的速度为高速路上速度的百分之几
[确认]E
[思路]缺少非高速路和高速路的比例。

50. DS：一个数列，平均数与和的比
（1）共有8个数
（2）和为100

[讨论]A. 平均数与和的比就为12.5/100=1/8。

66. A是positive integer，问A的value=?
1) 2，3，5是A的factors
2) 2，3，7是A的factors
我选E
[讨论] E。是否还有其他的隐含条件可以确定A的值？

68. 说某女有6个成绩successive排，问最后1个成绩是多少？
1)前4个成绩average 8.5
2)最后2个成绩sum是12
我做来做去不知道，就随便蒙了个E
前4个成绩average8.5，那sum是34，就是说可能是10，9，8，7那么后两个应该是6，5？后来想想成绩可能也有0.5的。反正是没做出来。
[讨论] E。是否差了中值或某一个具体数值？

Question: Successive? 连续的数?

69. 以前jj上见过的2个盒子装很多铅笔的那题，红铅笔长度相同，蓝色铅笔的average告诉你，具体的题目我有点忘记了。大家可以看看以前的JJ。

77. DS：甲乙到达同一目的地的所用时间之差。
1）都跑了100miles；
2）甲的速度比乙快5miles每小时；
我选C。

78. DS：一个含有10个数字(1,3,5,7,9,11,13,15,17,19)的数列的标准方差问题。问方差是否不变？
a: 抽掉2个数后，mean不变；
b: 抽掉2个数后，sum为90。
我选E

114. 10的50次方减74的值, 所有位数的和是多少? 440
[确定] 440

149. 有一个立方体, 长宽高分别是L, W, H. H是L的两倍, W是L的一半. 立方体的表面积是25,200, 求L的长度.
[确认]60

150. 2^N被3除余1, N是非负整数. 问下面哪一个必然正确.
I. N是大于0的整数
II. 3^N=(-3)^N
III．根好2^N为整数
我的答案是
[讨论] II和III

160. 有16个球,4个红,3个蓝,其他是绿,如果连续从中拿两个出来,而且不放回去,问两次拿的球中一个红一个蓝的概率. 我选4/16*3/15=1/20

172. 有card共36张分4组，每组9张，每张用数字1－9来表达。抽出一张，问抽出的几
a. 抽出一张后，35张的和的unit digit是6
b. 抽出一张后，35张牌的和是174
[确认]D

74. 40件jackets，一半卖80元，另一半打6折，只卖了这其中的一半，最后的再5折，问共卖了多少钱。
[确认]2320

178.（x/6-9）^2-(x/6+9)^2=? X^2/18+18

New JJ?

Total 84 Parents in school.

35 do one thing A.
11 Do both A and B(X)
The number of People doing B is 1.5 time of those who left.
i.e. (11+X)/(80-(35+X))=1.5 ==>Get X=25

Ask for the people do B.
I choose 36 =11+X

16朵花, 4红, 3蓝, 不放回地先取一朵红后取一朵蓝的概率？ ans: 1/20

RC：分数不是很高，这里就不误导大家了。文章不难读懂，但挺难确定选项.

EC concentration:
语言学native american language diversity

Acknowledgements:

I owes Special thanks to my wife NN, who help me a lot with all of any tirvial things she can do. And for sure I want To thanks thos on Robert's home and MBA8 for the Help they have provided.

I will pause here to try to add more later.

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