新gre數(shù)學(xué)重要考點(diǎn)：At Least Once

由雕龍文庫(kù) 分享時(shí)間：2024-03-16 18:19:36 收藏本文

　　2023新gre考試實(shí)施以來，不僅對(duì)寫作部分茫然不知所措，就連我們所擅長(zhǎng)的數(shù)學(xué)也甚是擔(dān)憂，相信這其中的原因還是由于考生在新gre數(shù)學(xué)復(fù)習(xí)時(shí)沒有把基礎(chǔ)打牢。如果新版gre數(shù)學(xué)基本考點(diǎn)都沒有復(fù)習(xí)到，如何能拿到分?jǐn)?shù)呢?所以說，想要新版gre數(shù)學(xué)考好，復(fù)習(xí)的時(shí)候一定要把基本概念和重要考點(diǎn)都弄扎實(shí)。

　　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.

　　由于美國(guó)數(shù)學(xué)基礎(chǔ)教育的難度增加導(dǎo)致數(shù)學(xué)考試越來越難，但新gre數(shù)學(xué)復(fù)習(xí)考點(diǎn)都是高中時(shí)候?qū)W到的知識(shí)點(diǎn)，考生不要過于緊張，把基本概念弄明白，再記住一些新版gre數(shù)學(xué)必備的詞匯，那么相信新版gre數(shù)學(xué)應(yīng)該沒有問題。