求教几道prep的题

kittenalways · 发表于 2011-11-13 21:34:56

if each term in the sum a1+a2+...+an is either 7 or 77 and the sum equals 350. n=？ 40

a committee of 3 people is to be chosen from 4 married couples. what's the number of differnt committees that can be choosen if 2 people who are married to each other cannot both serve on the committee? 32

a certain city with a population of 132000 is to be divided into 11 voting districts, andno district is to have a population that is more than 10% greater than the population of any other district. minimum possible population that the least population district =? 11000

求教几道prep的题

所属分类: GMAT考试

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