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2019年11月8日GRE數學預測沖高分 先刷預測再考170  GRE備考  第1張

題型

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

參考答案:C

分析:本題由于奇數和偶數數量同樣,和也只能二種方法,因此三個數的和為奇數的可能性為1/2。還可以考慮到從這100數量中任取三個數的奇偶,可能性為:奇奇奇,奇偶偶,奇奇偶和普普偶,其中奇奇奇和奇偶偶二種狀況的和為奇數,因此也獲得可能性為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%

參考答案:C

分析:A和B的并集為:54%+48%-30%=72%,所C為28%

2019年11月8日GRE數學預測沖高分 先刷預測再考170  GRE備考  第2張

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

參考答案:B

分析:設數量為x,設incorrect paper record有y, incorrect electric record有z,則:

足球竞彩网 x·y·60%=3%·x y=5%

足球竞彩网 x·z·75%=3%·x z=4%

ZE,ERZHEZUISHAOYOUYIGEBUZHENGQUEDEBAIFENSHUWEI5%+4%-3%=6%,SUOBIAOZHUNDAANWEI94%

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

參考答案: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數學預測沖高分 先刷預測再考170  GRE備考  第3張

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

參考答案:B

分析:劃到數據圖表來能夠一目了然:A, B均不產生的較大幾率為40%,最少幾率為0.因而選B

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