盒中有5个白球3个黑球,连续不放回地从中取两次球,每次取一个,求第二次取球取到白球的概率。
解析:设A表示“第一次取球取到白球”,B表示“第二次取球取到白球”,则P(A)=5/8,P()=3/8,P(B∣A)=4/7,P(B∣)=5/7.所以P(B)=P(A)P(B∣A)+P()P(B∣)=5/8×4/7+3/8×5/7=5/8.
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