请教高中数学题

来源: 于 2009-03-15 10:25:32 [旧帖] [给我悄悄话] 本文已被阅读：次

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)