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Answers for “这与条件概率的定义有什么关系？”

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The probability is $1/3$ . This is calculated using Bayes' theorem where event $A$ is 'two girls' and event $B$ is 'at least one girl'.

Conditions: Four equally likely ordered outcomes: GG, GB, BG, BB.; Event A: Two girls.; Event B: At least one girl.