m = 1032+2, when m is divided by 11, the remainder is r. Quantity A: r Quantity B: 3

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问题 m = 1032+2, when m is divided by 11, the remainder is r.
Quantity A: r
Quantity B: 3

选项 A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案C

解析 本题需求出m/11时的余数r,但m的数量较大,无法直接计算。于是考虑降低乘方的指数,当n=1,2,3,…时,(10n+2)/11的余数有什么规律。
n=1时,(101+2)/11=12/11=1……1:
n=2时,(102+2)/11=102/11=9……3;
n=3时,(103+2)/11=1002/11=91……1:
n=4时,(104+2)/11=10002/11=909……3:
可以观察到n为奇数时,余数为1;n为偶数时,余数为3。原指数32是偶数,则(1032+2)/11的余数r=3,与Quantity B相等,答案为C选项。
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本试题收录于: GRE QUANTITATIVE题库GRE分类
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