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2015年7月10日GRE数学机经

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1. The probability that event A will occur is 0.5. The probability that event B will occur is 0.4. The probability that event A or B will occur is 0.8.

  Column A:Probability that A and B both occur

  Column B:0.1

  A. The quantity in Column A is greater

  B. The quantity in Column B is greater

  C. The two quantities are equal

  D. The relationship cannot be determined from the information given

  2. Yesterday, at a certain school, the ratio of boys to girls was 1 to 3. Today, an equal number of boys and girls joined the school. The number that joined was greater than zero and no students left.

  Column A: Ratio of boys to girls now

  Column B: 1/3

  A. The quantity in Column A is greater

  B. The quantity in Column B is greater

  C. The two quantities are equal

  D. The relationship cannot be determined from the information given

  参考答案:1C 2A

重点单词   查看全部解释    
quantity ['kwɔntiti]

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n. 量,数量,大量

 
determined [di'tə:mind]

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adj. 坚毅的,下定决心的

 
certain ['sə:tn]

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adj. 确定的,必然的,特定的
pron.

 
column ['kɔləm]

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n. 柱,圆柱,柱形物,专栏,栏,列

 
probability [.prɔbə'biliti]

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n. 可能性,或然率,机率

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