GMAT 考满分题库

搜索
- 数学PS -
There is a stack of cards. 9 cards are blue and the rest are red. The probability of taking out two cards randomly that are both blue is 1/7. What's the number of the red cards?
  • A4
  • B5
  • C6
  • D7
  • E8
显示答案
正确答案: C

讨论题目 或 发起提问

|

题目讨论

  • 按热度
  • 按顺序

正确率： 23%

难度：


题目来源

题目来源1:190124

最新提问

保存笔记