如果说公共元素直推法是正面直接地解题，那么无关元素排除法就是从侧面解题的例子。我们看下面的例子。
一、无关元素排除法的简介。
1、定义。
无关元素排除法又叫无关词排除法，只要选项当中提到了文章之外的元素，那么这个选项一定不对。
2、依据。
归纳题的结论一定是从原文信息中总结归纳得出的，不可能得出和原文无关的内容。
(详情请看 GMAT逻辑排除法)
二、无关元素的类型
找到无关选项是用GMAT考试排除法的关键。GMAT无关选项的套路差不多, 平时做题是可以注意观察，或多总结一些典型例题。
无关选项出现的形式通常有几种：涉及不同(新)概念并且对新概念没有解释;没有解释原文的现象;或涉及与原文无关的内容(比如说原文谈论的是数量的比较, 选项中是与数量无关的内容)等等。
(详情请看 GMAT逻辑如何运用排除法)
三、无关元素排除法的应用举例
例一：
Experienced pilots often have more trouble than novice pilots in learning to fly the newly developed ultra light airplanes. Being accustomed to heavier aircraft, experienced pilots, when flying ultra light craft, seem not to respect the wind as much as they should.
The passage implies that the heavier aircraft mentioned above are____
(A) harder to land than ultra light aircraft
(B) not as popular with pilots as ultra light aircraft
(C) not as safe as ultra light aircraft
(D) more fuel-efficient than ultra light aircraft
(E) easier to handle in wind than ultra light aircraft
问题：下面哪一个可以被推出，如果上面的正确。
题干：地球大气当中流星的爆炸的当量相当于十二百万吨级的核爆炸的当量，大概一个世纪发生一次。由于复杂的计算机程序所控制的高自动的系统对突发时间的反应是不可预计的。
分析：两句话孤立，只能通过无关词排除。
选项：ABCD均有无关词，所以E正确。
注意新词：plan，designers在原文中有对应。
难点：选项换了词，但并不属于无关词。
例二：
The cost of producing radios in Country Q is 10 percent less than the cost of producing radios in Country Y. Even after transportation fees and tariff charges are added, it is still cheaper for a company to import radios from Country Q to Country Y than to produce radios in Country Y.
The statements above, if true, best support which of the following assertions?
(A) Labor costs in Country Q are 10 percent below those in Country Y.
(B) lmporting radios from Country Q to Country Y will eliminate i0 percent of the manufacturing jobs in Country Y.
(C) The tariff on a radio imported from Country Q to Country Y is less than 1O percent of the cost of manufacturing the radio in Country Y.
(D) The fee for transporting a radio from Country Q to Country Y is more than 10 percent of the cost of manufacturing the radio in Country Q.
(E) lt takes 10 percent less time to manufacture a radio in Country Q than it does in Country Y.
问题：The statements above, if true, best support…
题干：国家Q生产收音机的成本比国家Y低10%，即使运输费用和关税都被加上，在国家Q生产收音机进口到国家Y比在国家Y生产便宜。
分析：无公共元素，使用无关词排除法。
选项：A无关词labor costs
B无关词manufacturing jobs
E无关词time注意降低常识
C和D不含有无关词，通过文中内容进行判断。
(详情请看 GMAT逻辑题型)
以上是小编分享的归纳题的另一种解法——无关元素排除法，如果大家在归纳题中找不到公共元素，那么可以从选项入手，找选项中的无关信息，然后把无关选项排除，真相就会水落石出了。
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