新版gre数学复习重要考点：排列
<p> 俗话说：工欲善其事必先利其器。很多参加了新版<span word="gre">gre</span>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<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="Combinations">Combinations</span> <span word="of">of</span> <span word="Choices">Choices</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> 新版<span word="gre">gre</span>数学复习重要考点：<span word="Permutation">Permutation</span> <span word="of">of</span> <span word="Objects">Objects</span></p><p> <span word="The">The</span> <span word="number">number</span> <span word="of">of</span> <span word="ways">ways</span> <span word="n">n</span> <span word="distinct">distinct</span> <span word="objects">objects</span> <span word="can">can</span> <span word="be">be</span> <span word="ordered">ordered</span> <span word="is">is</span> <span word="n">n</span>!.</p><p> <span word="Example">Example</span>:</p><p> <span word="Number">Number</span> <span word="of">of</span> <span word="ways">ways</span> 6 <span word="people">people</span> <span word="can">can</span> <span word="from">from</span> <span word="a">a</span> <span word="queue">queue</span> <span word="is">is</span> 6!.</p><p> <span word="Number">Number</span> <span word="of">of</span> <span word="ways">ways</span> 5 <span word="different">different</span> <span word="cars">cars</span> <span word="can">can</span> <span word="be">be</span> <span word="parked">parked</span> <span word="in">in</span> 5 <span word="parking">parking</span> <span word="spaces">spaces</span> <span word="is">is</span> 5!.</p><p> <span word="Remember">Remember</span>:</p><p> <span word="This">This</span> <span word="does">does</span> <span word="not">not</span> <span word="apply">apply</span> <span word="if">if</span> <span word="there">there</span> <span word="are">are</span> <span word="identical">identical</span> <span word="objects">objects</span> <span word="or">or</span> <span word="ordering">ordering</span> <span word="does">does</span> <span word="not">not</span> <span word="matter">matter</span>.</p><p> 新版<span word="gre">gre</span>数学复习重要考点：<span word="Permutation">Permutation</span> <span word="with">with</span> <span word="Selection">Selection</span></p><p> <span word="The">The</span> <span word="number">number</span> <span word="of">of</span> <span word="ways">ways</span> <span word="n">n</span> <span word="objects">objects</span> <span word="drawn">drawn</span> <span word="from">from</span> <span word="a">a</span> <span word="collection">collection</span> <span word="of">of</span> <span word="m">m</span> <span word="distinct">distinct</span> <span word="objects">objects</span> <span word="can">can</span> <span word="be">be</span> <span word="ordered">ordered</span> <span word="is">is</span> <span word="m">m</span>!/!.</p><p> <span word="Example">Example</span>:</p><p> <span word="Number">Number</span> <span word="of">of</span> <span word="ways">ways</span> <span word="a">a</span> <span word="queue">queue</span> <span word="of">of</span> <span word="length">length</span> 3 <span word="can">can</span> <span word="be">be</span> <span word="formed">formed</span> <span word="from">from</span> <span word="a">a</span> <span word="group">group</span> <span word="of">of</span> 5 <span word="people">people</span> <span word="is">is</span> 5!/!=5!/2!=543=60.</p>
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