新gre数学重要考点：AT least One
<p> 2014新<span word="gre">gre</span>考试实施以来，不仅对写作部分茫然不知所措，就连我们所擅长的数学也甚是担忧，相信这其中的原因还是由于考生在新<span word="gre">gre</span>数学复习时没有把基础打牢。如果新版<span word="gre">gre</span>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<span word="gre">gre</span>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。</p><p> 今天针对新版<span word="gre">gre</span>数学复习，小编给大家整理的是关于<span word="AT">AT</span> <span word="least">least</span> <span word="One">One</span>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<span word="gre">gre</span>数学难的困境。</p><p> <span word="AT">AT</span> <span word="least">least</span> <span word="One">One</span></p><p> <span word="If">If</span> <span word="probability">probability</span> <span word="of">of</span> <span word="event">event</span> <span word="A">A</span> <span word="happening">happening</span> <span word="is">is</span> <span word="p">p</span> <span word="and">and</span> <span word="event">event</span> <span word="B">B</span> <span word="happening">happening</span> <span word="is">is</span> <span word="q">q</span>, <span word="then">then</span> <span word="the">the</span> <span word="probability">probability</span> <span word="that">that</span> <span word="at">at</span> <span word="least">least</span> <span word="one">one</span> <span word="of">of</span> <span word="them">them</span> <span word="happens">happens</span> <span word="is">is</span> .</p><p> <span word="Example">Example</span>:</p><p> <span word="There">There</span> <span word="are">are</span> 20 <span word="quarters">quarters</span>, 33 <span word="nickels">nickels</span>, <span word="and">and</span> 47 <span word="pennies">pennies</span> <span word="in">in</span> <span word="a">a</span> <span word="jar">jar</span>. <span word="The">The</span> <span word="probability">probability</span> <span word="that">that</span> <span word="a">a</span> <span word="randomly">randomly</span> <span word="selected">selected</span> <span word="coin">coin</span> <span word="is">is</span> <span word="a">a</span> <span word="quarter">quarter</span>= 20/=20/100=0.2 <span word="and">and</span> <span word="the">the</span> <span word="coin">coin</span> <span word="is">is</span> <span word="nickel">nickel</span> = 33/100 =0.33.<span word="The">The</span> <span word="probability">probability</span> <span word="it">it</span> <span word="is">is</span> <span word="either">either</span> <span word="a">a</span> <span word="quarter">quarter</span> <span word="or">or</span> <span word="a">a</span> <span word="nickel">nickel</span> = 0.2+0.33=0.53.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="The">The</span> <span word="events">events</span> <span word="needs">needs</span> <span word="to">to</span> <span word="be">be</span> <span word="mutually">mutually</span> <span word="exclusive">exclusive</span>, <span word="that">that</span> <span word="is">is</span> <span word="if">if</span> <span word="one">one</span> <span word="happens">happens</span> <span word="the">the</span> <span word="other">other</span> <span word="cannot">cannot</span> <span word="happen">happen</span>: <span word="a">a</span> <span word="coin">coin</span> <span word="is">is</span> <span word="either">either</span> <span word="a">a</span> <span word="quarter">quarter</span> <span word="or">or</span> <span word="nickel">nickel</span> <span word="but">but</span> <span word="not">not</span> <span word="both">both</span>.</p><p> 由于美国数学基础教育的难度增加导致数学考试越来越难，但新<span word="gre">gre</span>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<span word="gre">gre</span>数学必备的词汇，那么相信新版<span word="gre">gre</span>数学应该没有问题。</p>
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