GMAT 考满分题库

Magoosh - 数学PS - 351
A popular website requires users to create a password consisting of digits only. If no digit may be repeated and each password must be at least 9 digits long, how many passwords are possible?
  • A9! + 10!
  • B2 x 10!
  • C9! x 10!
  • D19!
  • E20!
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正确答案: B

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