If at least one child in a family with 2 children is a boy, then the probability that both children are boys is:
If at least one child in a family with 2 children is a boy, then the probability that both children are boys is:
1). $\frac{1}{4}$
2). $\frac{3}{4}$
3). $\frac{1}{3}$
4). $\frac{2}{3}$
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