think easier 回複：The answer is 32

來源: 於 2010-08-16 22:21:54 [舊帖] [給我悄悄話] 本文已被閱讀：次

view a pair as a single person, so we have c(3,4) but each pair can offer 2 choices. so tatol is c(3,4)*2*2*2*2 = 32.