2. 外语
  3. Which of the following numbers is NOT the sum of three consecutive odd integers?

Which of the following numbers is NOT the sum of three consecutive odd integers?

admin2009-05-19  34
问题 Which of the following numbers is NOT the sum of three consecutive odd integers?
选项 A、15
B、75
C、123
D、297
E、313
答案E
解析 下列哪一个不是3个连续奇整数(consecutive odd integer)的和?
解：本题的正确答案是(E)。设3个连续奇整数分别为2n+1，2n+3，2n+5，其中n为正数，则3个连续奇整数的和=(2n+1)+ (2n+3)+(2n+5)=3(2n+3)，因此3个连续奇整数的和必为3的倍数。本题中只有(E)不是3的倍数。
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本试题收录于： GRE QUANTITATIVE题库GRE分类
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