Gaokao Math Practice Question
从 20 名男同学, 10 名女同学中任选 3 名参加体能测试, 则选到的 3 名同学中既有男同学又有女同学的概率为($\qquad$)
- A.$\frac{9}{29}$
- B.$\frac{10}{29}$
- C.$\frac{19}{29}$
- D.$\frac{20}{29}$
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