尾数概率 请问从1-49这49个号码中不放回抽样7次,抽到尾数个数0和9的概率各是多少呢

请问从1-49这49个号码中不放回抽样7次,抽到尾数个数0和9的概率各是多少呢
0尾比较特别,是4个,其他尾数,如9尾是5个

第1个回答  2010-11-17
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