GRE数学2016.07.17机经
本次机经回忆非常感谢妙峰住宿部的jianrui；chengxue；guoqing；万寿路的zhen；yiming
1. There is a number list with a mean of 20, and standard deviation of o.
Quantity A
range of the number list
Quantity B
0
2. x＜y-4, where x and y are integers.
Quantity A
number of even integers between x and y
Quantity B
number of odd integers between x and y
3.
QuantityA
the average degrees of all interior angles in a trapezoid
Quantity B
the average degrees of all interior angles in a pentagon
4. In anumber set of A and B, the probability that the number in A which are greater than 50 is equal to the probability that the number in B which are greater than 55.
Quantity A
the average of set A
Quantity B
the average of set B
5. The polygon is made of a square and a triangle, what is the area of the polygon?
6.
7. 比较两个多边形的内角和（难道这名同学没有回忆错嘛？竟然出现了凹多边形）
8.
Quantity A
(x+y)(r+t)
Quantity B
r+t(x+y)
9. A circle is inscribed in a big square, the area of the square of ABOC is 5/π, what is the area of the circle?
10.
11. In a box of 10 electrical parts, 2 are defective, what is the probability thatneither of the parts selected will be defective?（数字填空题，分子分母的形式）
（官方指南的某道题：Of the 20 lightbulbs in a box, 2 are defective. An inspector will select 2 lightbulbs simultaneously and at random from the box. What is the probability that neither of the lightbulbs selected will be defective?）
12.
Ⅰ. W+Z=X+Y
Ⅱ. X+W=Y+Z
13. n is an integer made of some consecutive odd numbers from 1, like n=13579111315..., what is the units digit of n if it has only 41 digits?
（原文，n=1357111315...，问第41位的units digit是多少）
14.The profit that a merchant got when selling apples equals to the retail price minus the purchase price, if he sold n apples with a retail price of s and a profit of p each, what is the purchase price of each apple?
（原文：有个人买啥东西，profit=retail price – purchase price,他卖了n个，每个retail price 为s，profit是p，求每个的purchase price?）
(sn-p)/n=s-p/n（单选题）
15. n=11 was the sum of three positive integers, which two of following statements if true, can confirm three numbers?
（原文：n=11，由三个正整数相加得来，问下面哪两个条件成立，可以推出来这三个正整数）
Ⅰ. There is no 1 among three numbers.
Ⅱ. There is no 2 among three numbers.
Ⅲ. There is no 7 among three numbers.
Ⅳ. There is no 8 among three numbers.
16. A printer can print 10-15 pages for every minutes, person A printed for 3′12″，person B printed for 4′48″, which of following must be true?
Ⅰ. A had printed at least 32 pages
Ⅱ. B had printed at least 48 pages
Ⅲ. B had printed more pages than A
17. A word with 3 letters which two of them must be the same was chose from 33-letters alphabet, how many words are possible?
（原文：三个字母组成的单词在33-letters alphabet 中选，其中有两个letters要是一样的，问有多少different ways，答案从1000多到6000多）
18.（据学员反馈，考到了类似于OG中261页的题目，如下）
19. What is the value of z?
20. If p=r^n, r is a prime number, and n is a positive integer, then define p▼=pn, for example, 25=5^2, then 25▼=25*2=50. what is value of 32▼?
（本人在6.17考到了非常类似的题目：If p=r^n, r is a prime number, and n is a positive integer, then define p▲=rn, for example, 25=5^2, then 25▲=5*2=10. what is value of 32▲?）
21.The radii of two concentric circles are r and R, what is the ratio of minor arc ACB to minor arc DEF?
22. Which of following number is in 1.021~1.029g/cm³ ?
A. 100.25mg/cm³
B. 1.08kg/m³
C. 1.029*10³kg/L
D. ......
23.有一个图表几乎考的都是比率比例的知识
24.
25.据学员反馈，考试还考到Venn 图，下面给一到OG的题目大家可以练练手（P295）
特别说明：
本材料仅供学员老师学习交流，切勿用于商业用途
资源来源于各位北京新东方老师学员考试回忆，望各位老师同学考试后也可以给我贡献机经，之后我会继续分享给“后人”
题目中的数据不一定完全准确，仅供参考学习，同时建议大家把手里的资料做完了以后（包括官方指南，官方150题，PP2），再做这些题目，主要目的是让大家看一下考试都会考察哪些题目。