GMAT 考满分题库

Magoosh - 数学PS - 23
Joan is allowed to invite 3 of her friends to join her on a family camping trip. If Joan has 10 friends, in how many ways can she invite 3 of them?
  • A27
  • B120
  • C140
  • D360
  • E720
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正确答案: B

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