GMAT 考满分题库

- 数学PS -
Let S be the set of all positive integers having at most 4 digits and such that each of the digits is 0 or 1. What is the greatest prime factor of the sum of all the numbers in S ?
  • A11
  • B19
  • C37
  • D59
  • E101
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正确答案: E

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