請教高中數學題

Five cards are drawn from an ordinary deck of 52 playing cards. Find the probability of getting two pairs.( For example, the hand could be A-A-5-5-Q or 4-4-7-7-K)

所有跟帖： 

• 33.81% ? -dubious- ♂ (50 bytes) () 03/15/2009 postreply 12:57:49

• 回複：33.81% ? -ruby88- ♀ (78 bytes) () 03/15/2009 postreply 13:02:43

• 回複：請教高中數學題 -gguyy- ♂ (52 bytes) () 03/15/2009 postreply 19:14:42

• 回複：回複：請教高中數學題 -stephen7yu- ♂ (5 bytes) () 03/16/2009 postreply 05:31:01

• 看錯了, 答案應該是0.0475, 你是對的. -ruby88- ♀ (0 bytes) () 03/16/2009 postreply 08:07:59

• 嗯，gguyy的算法好像是對的，雖然和答案不一樣；如果再加上 -dubious- ♂ (151 bytes) () 03/16/2009 postreply 00:28:42