sorry, should be "1513"

來源: 2010-09-09 12:04:38 [博客] [舊帖] [給我悄悄話] 本文已被閱讀:

P4 * (E(9,7,6,4,3,1) + E(7,5,4,2,1) + E(5,3,2) + E(3,1)+ 1 = 4! * (30 + 19 + 10 + 4 )+ 1 = 63 * 4! + 1= 1513