回複:印尼奧賽題:非空子集(2.5星)

來源: 2009-01-31 23:46:06 [博客] [舊帖] [給我悄悄話] 本文已被閱讀:

C(2010,2008)-C(3,1)*C(2009,2008)=2019045-3*2009=2013018