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一道GMAT数学题目!急求解答。。Acertainlawfirmconsistsof4seniorpartnersand6juniorpartners.Howmanydifferentgroupsof3partnerscanbeformedinwhichatleastonememberofthegroupisaseniorpartner?(Twogroupsareco

题目详情
一道GMAT数学题目!急求解答。。
A certain law firm consists of 4 senior partners and 6 junior partners. How many different groups of 3 partners can be formed in which at least one member of the group is a senior partner? (Two groups are considered different if at least one group member is different.
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答案和解析
C3 -C3=120-20=100
10 6