一對兒 5張一對兒中隻有4種點不同,共有C(13,4)種,如AKQJ,各張有4色,AAKQJ,AKKQJ....AKQJJ有C(4,2)C(4,1)C(4,1)C(4,1)C(4,1)所以有C(13,4)C(4,2)C(4,1)C(4,1)C(4,1)C(4,1)/C(52,5)...
三對兒 5張3對兒中隻有3種點不同:C(13,3)C(4,3)C(4,1)C(4,1)C(3,1)/C(52,5)...
3,2 P(13,2)C(4,3)*C(4,2)/C(52,5)=0.00140576