小明過年期間去拜訪許久沒見面的同學，聽說同學
已經生了兩個小孩，進門後小明看到朋友其中一個小孩
是男生，請問，另一個是男生的機率為多少？
Mr. Jones has two children. The older child is a girl. What is the probability that both children are girls?
Mr. Smith has two children. At least one of them is a boy. What is the probability that both children are boys?
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