1.A construction company was paid a total of$500,000 for a c

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1.A construction company was paid a total of$500,000 for a construction project.Thecompany’s only costs for the project were for labor and materials.Was the company’s profit for the projectgreater than $150,000?
(1) The company’s total cost was three times itscost for materials.
(2) The company’s profit was greater than itscost for labor.
2.
A certain roller coaster has 3 cars,and apassenger is equally likely to ride in any 1 of the 3 cars each time thatpassenger rides the roller coaster.If acertain passenger is to ride the roller coaster 3 times,what is theprobability that the passenger will ride in each of the 3 cars?
A.0
B.1/9
C.2/9
D.1/3
E.1
（答案为3×2×1=6,3×3×3=27,6／27)可是不是在三辆车中任选一辆吗?为什么第二次只能在两辆车中选了呢,第三次只能选一辆了呢?

第一题从题面无法解答,只能从社会知识来解答,答案为2
理由：该建筑公司收入为50万,利润要大于15万,则总成本必须低于35万.而两项成本中,社会统计数据是人工成本点总成本的6—12.5%,这虽然是一个大概数据,但充其量按40%计,人工成本也不超过35*40%=14万,因此利润（15万）肯定大于人工成本（14万）.
第二题：因为是equally公平选择,而不是随机选择.意思是一旦被选中就不能再选了.好比抽奖,100个人有100个号码,放进纸箱里抽奖,前面抽二、三等奖时被抽中过一次,则再抽一等奖时就没有机会再抽了,因为抽奖的机会是公平的每个人一次,而不是前面被抽中后又把奖票放进抽奖箱可以重复抽后面的奖项.

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