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Augustus DeMorgan made many valuable contributions to

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Augustus DeMorgan made many valuable contributions to [#permalink] New post 21 Sep 2012, 22:40
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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
[Reveal] Spoiler: OA

Last edited by saikarthikreddy on 21 Sep 2012, 22:43, edited 1 time in total.
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Re: Augustus DeMorgan made many valuable contributions [#permalink] New post 21 Sep 2012, 22:41
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] New post 21 Sep 2012, 23:03
d.two theorems are plural so it contradict with the main verb
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Re: Augustus DeMorgan made many valuable contributions [#permalink] New post 22 Sep 2012, 04:17
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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] New post 22 Sep 2012, 06:39
Thanks for the explanation daagh .
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Re: Augustus DeMorgan made many valuable contributions [#permalink] New post 23 Sep 2012, 07:47
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 to [#permalink] New post 26 Aug 2014, 14:38
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Augustus DeMorgan made many valuable contributions to [#permalink] New post 27 Aug 2014, 20:36
daagh wrote:
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 .


I am confused with choosing A or D. It helps me answer my question.
Thank your for exp.
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Re: Augustus DeMorgan made many valuable contributions to   [#permalink] 27 Aug 2014, 20:36
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