说明
jinjing
2010-09-24 07:42:37
( reads)
一对儿 5张一对儿中只有4种点不同,共有C(13,4)种,如AKQJ,各张有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)...
三对儿 5张3对儿中只有3种点不同: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