GRE数学考点介绍：Conditional
<p> <span word="Conditional">Conditional</span></p><p> <span word="Probability">Probability</span> <span word="of">of</span> <span word="event">event</span> <span word="A">A</span> <span word="conditioned">conditioned</span> <span word="on">on</span> <span word="the">the</span> <span word="fact">fact</span> <span word="that">that</span> <span word="event">event</span> <span word="B">B</span> <span word="has">has</span> <span word="happened">happened</span> <span word="is">is</span> <span word="called">called</span> <span word="the">the</span> <span word="conditional">conditional</span> <span word="probability">probability</span> <span word="and">and</span> <span word="written">written</span> <span word="as">as</span> <span word="P">P</span>.</p><p> <span word="P">P</span>=<span word="Probability">Probability</span> <span word="Both">Both</span> <span word="A">A</span> <span word="and">and</span> <span word="B">B</span> <span word="happens">happens</span>/ <span word="Probability">Probability</span> <span word="B">B</span> <span word="happens">happens</span>.</p><p> <span word="Example">Example</span>:</p><p> <span word="A">A</span> <span word="six">six</span>-<span word="sided">sided</span> <span word="die">die</span> <span word="with">with</span> <span word="faces">faces</span> <span word="from">from</span> 1 <span word="to">to</span> 6 <span word="is">is</span> <span word="rolled">rolled</span> <span word="twice">twice</span>. <span word="What">What</span> <span word="is">is</span> <span word="the">the</span> <span word="probability">probability</span> <span word="that">that</span> <span word="the">the</span> <span word="face">face</span> 5 <span word="turned">turned</span> <span word="up">up</span> <span word="on">on</span> <span word="first">first</span> <span word="try">try</span> <span word="given">given</span> <span word="that">that</span> <span word="the">the</span> <span word="sum">sum</span> <span word="of">of</span> <span word="the">the</span> <span word="two">two</span> <span word="faces">faces</span> <span word="is">is</span> 9?</p><p> <span word="P">P</span>=4/36=1/9.</p><p> <span word="P">P</span>==1/36.</p><p> <span word="P">P</span>==1/4</p><p> <span word="Remember">Remember</span>:</p><p> <span word="If">If</span> <span word="P">P</span>=<span word="P">P</span>,<span word="then">then</span> <span word="two">two</span> <span word="events">events</span> <span word="A">A</span> <span word="and">and</span> <span word="B">B</span> <span word="are">are</span> <span word="independent">independent</span>, <span word="that">that</span> <span word="is">is</span> <span word="occurrence">occurrence</span> <span word="of">of</span> <span word="one">one</span> <span word="does">does</span> <span word="not">not</span> <span word="influence">influence</span> <span word="the">the</span> <span word="other">other</span></p><p> 以上就是<span word="GRE">GRE</span>数学常考题总结，大家需要多加练习，总结易错点，进行集中突击。在考前，最好把错题都重看一遍，以免在考场上犯同样的错误。</p><p> </p><p> </p>
页:
[1]