标题:
one of FF
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作者:
cook
时间:
2002-10-10 12:59
标题:
one of FF
6、袋中有a只白球,b只红球,依次将球一只只摸出,不放回,求第K次摸出白球的概率
作者:
tongxun
时间:
2002-10-10 16:58
cooK: I am not quiet sure.
[b/(a+b)]*[(b-1)/(a+b-1)]* ......*{ [ b-(k-2)]/[a+b-(k-2)] *(a/(a+b-k)
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