6. The reflection of a positive integer is obtained by reversing its digits. For example, 321 is the reflection of 123. The difference between a five-digit integer and its reflection must be divisible by which of the following?

　　A.2 B.4 C.5 D.6 E.9

　　7. Column A: 1/

　　Column B: 1.03

　　8.The original value of machine X is V dollars, while the original value of machine Y is 2V dollars. Both machines depreciate in value at a constant rate of 10 percent of their original value per year.

　　Column A: The value of machine X after 3 years

　　Column B: The value of machine X after 6 years

　　9. If n is an odd integer, which of the following is the square of the next larger odd integer?

　　A. nn+1 B. nn+4 C. nn+2n+1 D. nn+4n+1 E.nn+n+1

　　10. If 55 percent of a group of people have brown hair and 80 percent of the same group do not have red hair, what fraction of those who do not have brown hair red hair?

　　A. 1/4 B.4/11 C.4/9 D.5/9 E.4/5

　　最新的gre数学难题中有很多gre数学考试中常见的难题，而且难题涉及的范围也比较广泛，考生在复习时一定要多注意日常的练习和积累。

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