GMAT数学题库练习题及答案【2】!在GMAT数学备考中考生一定要结合练习掌握考试知识点,为了方便考生做练习,智课网为大家整理了GMAT数学题库练习题及答案,更多GMAT数学题库资料尽在智课网。

  There are 8 books on a shelf, of which 2 are paperbacks and6 are hardbacks. How many possibleselections of 4 books from this self include at least one paperback?

  A. 40

  B. 45

  C. 50

  D. 55

  E. 60

  参考答案:D

  题目翻译:8本书,2本纸封,6本硬封。选四本至少一本纸封的选法几种。

  题目全解:总的选法-全都是硬封=至少一本纸封=C(4,8)-C(4,6)=55。

  A certain roller coaster has 3 cars, and a passenger isequally likely to ride in any 1 of the 3 cars each time that passenger ridesthe roller coaster. If a certainpassenger is to ride the roller coaster 3 times, what is the probability thatthe passenger will ride in each of the 3 cars?

  A. 0

  B. 1/9

  C. 2/9

  D. 1/3

  E. 1

  参考答案:C

  题目翻译:三个车,一个乘客每次随便挑一个坐。做了三次,求三次都不同一车的概率。

  题目全解:1*(2/3)*(1/3)=2/9。

  The value of (9*10^7)(9*10^8)is closest to which of the following?

  A. 10^16

  B. 10^17

  C. 10^56

  D. 10^57

  E. 10^58

  参考答案:B

  题目翻译:(9*10^7)(9*10^8)和那个最接近

  题目全解:

  等式=81*10^15约等于100*10^15。

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