一个口袋中装有6个小球,其中红球4个,白球2个,如果不放回地依次

一个口袋中装有6个小球,其中红球4个,白球2个,如果不放回地依次摸出2个小球,则在第一次摸出红球的条件下,第2次摸出红球的概率为                .

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