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Gaokao Math Practice Question

4. (5 分) 有 3 个兴趣小组, 甲、乙两位同学各自参加其中一个小组, 每位同 学参加各个小组的可能性相同, 则这两位同学参加同一个兴趣小组的概率为 ( )

  1. A.$\frac{1}{3}$
  2. B.$\frac{1}{2}$
  3. C.$\frac{2}{3}$
  4. D.$\frac{3}{4}$

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