2015年新GRE数学预测题及答案解析

GRE考试取得高分，除了掌握一些答题技巧，再加上不断地练习，没有其他捷径。为了能给大家提供一些练习的机会，新通小编跟大家分享2015年9月GRE数学预测题，希望大家好好珍惜。

预测一：
       1. 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
　　解：设总数为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，两者至少有一个错误的百分比为5%+4%-3%=6%，所正确答案为94%
　　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%
　　解：A和B的并集为：54%+48%-30%=72%，所C为28%.
预测二：
　　1. The probability that event A will occur is 0.5. The probability that event B will occur is 0.4. The probability that event A or B will occur is 0.8.
　　Column A：Probability that A and B both occur
　　Column B：0.1
　　A. The quantity in Column A is greater
　　B. The quantity in Column B is greater
　　C. The two quantities are equal
　　D. The relationship cannot be determined from the information given
　　2. Yesterday, at a certain school, the ratio of boys to girls was 1 to 3. Today, an equal number of boys and girls joined the school. The number that joined was greater than zero and no students left.
　　Column A: Ratio of boys to girls now
　　Column B: 1/3
　　A. The quantity in Column A is greater
　　B. The quantity in Column B is greater
　　C. The two quantities are equal
　　D. The relationship cannot be determined from the information given
GRE数学参考答案：1C 2A
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