出个数学题：1到36号球，选6个，1号和2号同时选上的机率多大？

所有跟帖： 

• hate probability! -roxybaby1112- ♀ (0 bytes) () 05/04/2009 postreply 18:38:18

• 比你当上澳坛斑猪的机会大小小~~ -豆腐板- ♂ (0 bytes) () 05/04/2009 postreply 18:42:44

• 你个老右派~~~~ -soulclinic- ♂ -Fagger- ♂ -秋收- ♀ (24 bytes) () 05/04/2009 postreply 18:44:45

• 1/(36^2) -Rafale- ♂ (0 bytes) () 05/04/2009 postreply 18:52:29

• 为什么？ -臭鼬，花花的- ♀ (0 bytes) () 05/04/2009 postreply 19:01:12

• it's wrong, ha -Rafale- ♂ (0 bytes) () 05/04/2009 postreply 19:13:50

• 怎么觉得是1/（36X35）呢？ -吃睡长- ♀ (0 bytes) () 05/04/2009 postreply 19:12:06

• 我怎么觉得是1/（36X35）呢？难道我错了？ -吃睡长- ♀ (0 bytes) () 05/04/2009 postreply 19:11:22

• 2nd attempt: ans: 1/42 -Rafale- ♂ (9 bytes) () 05/04/2009 postreply 19:21:57

• 觉得还是1（36X35） -吃睡长- ♀ (241 bytes) () 05/04/2009 postreply 20:15:46

• u confused "nCr" & "nPr" -Rafale- ♂ (0 bytes) () 05/04/2009 postreply 20:41:30

• O -吃睡长- ♀ (0 bytes) () 05/05/2009 postreply 01:12:23

• 瞎猜。。。1/18 -林三少- ♂ (0 bytes) () 05/04/2009 postreply 19:26:33

• C4 34/ C6 36 = 2.38% -purplenight- ♀ (0 bytes) () 05/04/2009 postreply 20:45:24

• 34和36都是3围数字吗？？~~ -豆腐板- ♂ (0 bytes) () 05/04/2009 postreply 21:21:32

• (34 C 4)/(36 C 6)=0.02381 -gstfree- ♂ (31 bytes) () 05/05/2009 postreply 19:16:36