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俗话说：工欲善其事必先利其器。很多参加了新版gre考试的同学都觉得数学有点难度，相信这其中的原因还是由于考生在新版gre数学复习时没有把基础打牢。如果新版gre数学基本考点都没有复习到，如何能拿到分数呢?所以说，想要新版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。 今天针对新版gre数学复习，小编给大家整理的是关于At Least Once的相关内容，这些概念在考试中一定会考到的。希望考生能再接再厉，取得一个好成绩，突破新版gre数学难的困境。 新版gre数学复习重要考点：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-n. Example: To understand the equation follow these steps: 1.The probability of the event not happening is 1-p. 2.The probability it wont happen n-times in a row is n. 3.Probability it will happen at least once is 1-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:=1-3=1-3. Remember: It is much harder to directly calculate the at-least-once probability. | 
