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Augustus DeMorgan made many valuable contributions to [#permalink]
 21 Sep 2012, 23:40
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60% (01:41) correct
40% (00:41) wrong based on 35 sessions
Augustus DeMorgan made many valuable contributions to calculus, trigonometry, algebra, and logic; but perhaps his most famous academic contribution, a pair of theorems concerning complementation of sets, is still known today as DeMorgan’s Rules. a.a pair of theorems concerning complementation of sets, is b.a pair of theorems concerning complementation of sets, are c.two theorems that have to do with complementation of sets, are d.two theorems that define complementation of sets, is e.two theorems that are both related to complementation of sets, are
Last edited by saikarthikreddy on 21 Sep 2012, 23:43, edited 1 time in total.
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Re: Augustus DeMorgan made many valuable contributions [#permalink]
21 Sep 2012, 23:41
Can experts please explain why option A is preferred over option D.Thanks !!
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Re: Augustus DeMorgan made many valuable contributions [#permalink]
22 Sep 2012, 00:03
d.two theorems are plural so it contradict with the main verb
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Re: Augustus DeMorgan made many valuable contributions [#permalink]
22 Sep 2012, 05:17
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The subject ‘contribution’ plays a key role in deciding the answer here. First being a singular subject, the subject’s verb also should be singular –i.e.: is, dismissing B, C and E. Second, the singular subject entails a singular appositive modifier, namely, a pair as in A and not two theorems as in D. Hence A .
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Re: Augustus DeMorgan made many valuable contributions [#permalink]
22 Sep 2012, 07:39
Thanks for the explanation daagh .
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Re: Augustus DeMorgan made many valuable contributions [#permalink]
23 Sep 2012, 08:47
I chose A for the following reasons:
1. the Qn has non-essential modifier marked with ",". Thus we can disregard it. Subject contribution, verb is known as contribution is singular. Options A and D left;
2. Verb define in option D changes the meaning the sentence - we don't know for sure, whether they defined or concerned complementation of sets. Option A left.
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Re: Augustus DeMorgan made many valuable contributions
[#permalink]
23 Sep 2012, 08:47
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