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-(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't 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.
很多新版gre数学复习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，再记住一些新版gre数学必备的词汇，那么相信新版gre数学应该没有问题。