2019年11月8日场数GRE数学预测分析公布,详尽內容包含对11月8日GRE数学各大高频率考试点题型的实际解读和答题思路分析,保证学生没有简易数学一部分意外事故丢分,圆满得到高分数考满分!

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2019年11月8日GRE数学预测冲高分 先刷预测再考170  GRE备考  第1张

题型

1. A box contains 100 balls, numbered from 1 to 100.If three balls are selected at random and with replacement from the box, what is the probability that the sum of the three numbers on the balls selected from the box will be odd?

A. 1/4

B. 3/8

C. 1/2

D. 5/8

E. 3/4

参考答案:C

分析:本题由于奇数和偶数数量同样,和也只能二种方法,因此三个数的和为奇数的可能性为1/2。还可以考虑到从这100数量中任取三个数的奇偶,可能性为:奇奇奇,奇偶偶,奇奇偶和普普偶,其中奇奇奇和奇偶偶二种状况的和为奇数,因此也获得可能性为1/2

2. There are 1200 respondents to a poll, each favoring their preference for candidates A,B, and C. 54% favored A, 48% favored B, and 42% favored C, and there is 30% favored both A and B. What’s the largest possible number of respondents favoring C, but not C&B, nor C&A?

A. 25%

B. 30%

C. 28%

D. 38%

E. 40%

参考答案:C

分析:A和B的并集为:54%+48%-30%=72%,所C为28%

2019年11月8日GRE数学预测冲高分 先刷预测再考170  GRE备考  第2张

3. In an insurance company, each policy has a paper record and an electric record. For those policies having incorrect paper record, 60% also having incorrect electric record; For policies having incorrect electric record, 75% also having incorrect paper record.3% of all policies have both incorrect paper and incorrect electric records. If we randomly pick out one policy, what’s the probability that the one having both correct paper and correct electric records?

A. 0.80

B. 0.94

C. 0.75

D. 0.88

E. 0.92

参考答案:B

分析:设数量为x,设incorrect paper record有y, incorrect electric record有z,则:

x·y·60%=3%·x y=5%

x·z·75%=3%·x z=4%

则,二者最少有一个不正确的百分数为5%+4%-3%=6%,所标准答案为94%

4. If Bob can do a job in 20 days and Jane can do the job in 30 days, they work together to do this job and in this period, Bob stop work for 2.5 days and Jane stop work for x days, and the job be finished for 14 days, what is x?

A. 1.6

B. 3.2

C. 1.5

D. 1.25

E. 1.15

参考答案:D

分析:1/20(14-2.5)+1/30(14-x)=1,算出x=1.25

2019年11月8日GRE数学预测冲高分 先刷预测再考170  GRE备考  第3张

5. The probability of A is 60% and the probability of B is 50%, what is the most possible probability that neither A nor B would happen?

A. 0.80

B. 0.40

C. 0.75

D. 0.55

E. 0.68

参考答案:B

分析:划到数据图表来能够一目了然:A, B均不产生的较大几率为40%,最少几率为0.因而选B

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