請教高中數學題

來源: 2009-03-15 10:25:32 [舊帖] [給我悄悄話] 本文已被閱讀:

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)