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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.
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）
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