题目信息
A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
A:$$\frac{3}{8}$$
B:$$\frac{1}{4}$$
C:$$\frac{3}{16}$$
D:$$\frac{1}{8}$$
E:$$\frac{1}{16}$$
参考答案及共享解析

共享解析来源为网络权威资源、GMAT高分考生等; 如有疑问,欢迎在评论区提问与讨论
本题耗时:
已选答案:
正确答案:
A:$$\frac{3}{8}$$
权威答案解析正在整理中,即将上线。


题目来源