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新GRE数学考点介绍:At Least Once.

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  新GRE数学考试的考点都是高中时候学到的知识点,考生不要过于紧张,把基本概念弄明白,再记住一些新GRE数学必备的词汇,那么相信新GRE数学应该没有问题。下面澳际小编给大家整理的是关于At Least Once的相关内容,希望对各位考生有所帮助。

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  At Least Once

  If probability of an event happening is p, then the probability that the event happens at least once in n trials is 1-(1-p)∧n.

  Example:

  To understand the equation follow these steps:

  1.The probability of the event not happening is 1-p.

  2.The probability it won&apost happen n-times in a row is (1-p)∧n.

  3.Probability it will happen at least once is 1-(1-p)∧n.

  Probability that a roll of a six-sided die land with face 1 is 1/6.Then the probability that 1 will turn up at least once in 3 tries:=1-(1-1/6)∧3=1-(5/6)∧3.

  Remember:

  It is much harder to directly calculate the at-least-once probability.

  有一部分考生认为新GRE数学具有一定的难度,这其中的原因是由于考生在复习时没有把新GRE数学的基础打牢。想要新GRE数学考好,复习的时候一定要把基本概念和重要考点都弄扎实。祝大家都能取得理想成绩!

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