两副牌104张,随机拿5张,拿到4张或5张一样的牌的概率
两副牌104张,随机拿5张,拿到4张或5张一样的牌的概率
日期:2022-04-12 06:07:36 人气:1
(COMBIN(13,1)*COMBIN(8,5)+COMBIN(13,1)*COMBIN(8,4)+/COMBIN(12,1)*COMBIN(8,1))/COMBIN(104,5)
=(13*56+13*70*12*8)/91962520
≈0.00096
=(13*56+13*70*12*8)/91962520
≈0.00096