2. 外语
  3. Select 4 people from 3 boys and 3 girls. What is the probability of two boys and two girls being selected?

Select 4 people from 3 boys and 3 girls. What is the probability of two boys and two girls being selected?

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问题 Select 4 people from 3 boys and 3 girls. What is the probability of two boys and two girls being selected?
选项 A、3/15
B、4/9
C、3/5
D、2/3
E、1/3
答案C
解析 从3男3女中选取4人，一共有C64=15种取法。选2男2女的选法是，从3个男的中选择2个，再从3个女的中选择2个，共9种取法，所以所求概率是9/15=3/5。
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