think easier 回复：The answer is 32

来源: mathg 于 2010-08-16 22:21:54 [] [旧帖] [给我悄悄话] 阅读数 : (118 bytes)
回答: 排列组合 由 数学题 于 2010-07-21 23:01:59

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.

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