GMAT 考满分题库

- 数学PS -
The difference 942 - 249 is a positive multiple of 7. If a,b, and c are nonzero digits, how many 3-digit numbers abc are possible such that the difference abc - cba is a positive multiple of 7?
  • A142
  • B71
  • C99
  • D20
  • E18
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正确答案: E

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