prep求助啊啊，标题长长长

lvbin19900809 · 发表于 2011-4-5 00:14:28

a certain law firm consists of 4 senior partners and 6 junior partners.how many differnet groups of 3 partners can be formed in which at least one member of the group is a senior partner?9(two groups are considered different if at least one group member is different)
答案是100

brendaqian · 发表于 2011-4-5 00:18:30

C310-C36

lvbin19900809 · 发表于 2011-4-5 00:22:00

啊？神马

lvbin19900809 · 发表于 2011-4-5 00:32:01

同学，那个c310是什么上面的啊

lepus0107 · 发表于 2011-4-5 00:35:46

有3种情况符合条件：1senior2junior,2senior1junior,3senior.求解过程：4*C（62）+C（42）*6+C（43）=4*15+6*6+4=100

lvbin19900809 · 发表于 2011-4-5 00:38:50

谢谢了，我理解错了题目的意思

prep求助啊啊，标题长长长

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块