【GMAT考满分数学PS题库】A couple decides to have 4 children. If they succe_真题_答案

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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 $\frac{1}{16}$

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正确答案: A

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