GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 17 Oct 2018, 19:56

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Augustus DeMorgan made many valuable contributions to

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
User avatar
Joined: 19 Apr 2011
Posts: 209
Schools: Booth,NUS,St.Gallon
Augustus DeMorgan made many valuable contributions to  [#permalink]

Show Tags

New post Updated on: 21 Sep 2012, 23:43
2
14
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

57% (00:59) correct 43% (01:01) wrong based on 497 sessions

HideShow timer Statistics

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

Originally posted by saikarthikreddy on 21 Sep 2012, 23:40.
Last edited by saikarthikreddy on 21 Sep 2012, 23:43, edited 1 time in total.
Most Helpful Expert Reply
Retired Moderator
User avatar
D
Status: worked for Kaplan's associates, but now on my own, free and flying
Joined: 19 Feb 2007
Posts: 4479
Location: India
WE: Education (Education)
Re: Augustus DeMorgan made many valuable contributions  [#permalink]

Show Tags

New post 22 Sep 2012, 05:17
12
5
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 .
_________________

you can know a lot about something and not really understand it."-- a quote
No one knows this better than a GMAT student does.
Narendran +9198845 44509

General Discussion
Manager
Manager
avatar
Status: Bunuel's fan!
Joined: 08 Jul 2011
Posts: 175
Re: Augustus DeMorgan made many valuable contributions  [#permalink]

Show Tags

New post 22 Sep 2012, 00:03
1
d.two theorems are plural so it contradict with the main verb
Intern
Intern
avatar
Joined: 23 Jun 2012
Posts: 3
GMAT 1: 660 Q44 V37
Re: Augustus DeMorgan made many valuable contributions  [#permalink]

Show Tags

New post 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.
Manager
Manager
User avatar
Joined: 22 Feb 2009
Posts: 175
GMAT ToolKit User
Re: Augustus DeMorgan made many valuable contributions to  [#permalink]

Show Tags

New post 27 Aug 2014, 21:36
2
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.
+1 kudos :)
_________________

.........................................................................
+1 Kudos please, if you like my post

Board of Directors
User avatar
P
Status: QA & VA Forum Moderator
Joined: 11 Jun 2011
Posts: 4094
Location: India
GPA: 3.5
WE: Business Development (Commercial Banking)
GMAT ToolKit User Premium Member
Re: Augustus DeMorgan made many valuable contributions to  [#permalink]

Show Tags

New post 07 Sep 2015, 10:30
1
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.

his most famous academic contribution-------> Contribution referes to Singular Object...

So the decision point is IS / ARE

The correct answer will include IS , Only OPtions (A) and (D) are available...

(D) two theorems that define complementation of sets, is ----> Two theorems............must be are

(A) a pair of theorems concerning complementation of sets, is -----> A pair of ........ is (Correct)


Hence (A) is the best choice...
_________________

Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )

Retired Moderator
User avatar
S
Joined: 18 Sep 2014
Posts: 1132
Location: India
GMAT ToolKit User Premium Member Reviews Badge
Augustus DeMorgan made many valuable contributions to  [#permalink]

Show Tags

New post 05 Mar 2016, 11:59
2
Quote:
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


Subject-verb combination quickly eliminated B, C and E due to plural verb are.

Coming to A and D, both are different in meaning.

Quote:
Concern means Relate to;
the story concerns a friend of mine
(be concerned with) this fable is concerned with forgiveness and redemption

MORE EXAMPLE SENTENCES
Of course, the Today Tonight story was only concerned with the latter issue.
Julian Barnes's new book of short stories is concerned with old age and death.

View synonyms
involved, affected; connected, related, implicated


a pair of theorems related to complementation of sets is not the same as two theorems that define complementation of sets since we do not know whether theorems are just related to the complementation of sets or they define complementation of sets.
We cannot assume so go for A. :)
Intern
Intern
User avatar
Joined: 05 Mar 2016
Posts: 8
Concentration: Finance, Strategy
Schools: Imperial '18
CAT Tests
Re: Augustus DeMorgan made many valuable contributions to  [#permalink]

Show Tags

New post 05 Mar 2016, 12:40
3
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.

answer A .
_________________

Please press 1 kudos if you like my post .Thanks

Director
Director
avatar
S
Joined: 12 Nov 2016
Posts: 749
Location: United States
Schools: Yale '18
GMAT 1: 650 Q43 V37
GRE 1: Q157 V158
GPA: 2.66
Re: Augustus DeMorgan made many valuable contributions to  [#permalink]

Show Tags

New post 19 Aug 2017, 15:32
saikarthikreddy wrote:
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


The subject w/r/t the state of being verb (is/are) is "academic contribution" - this is singular
The modifier that comes after simply describes the contribution but does not change its person (singular/ plural)

A
Non-Human User
User avatar
Joined: 01 Oct 2013
Posts: 3197
Premium Member
Re: Augustus DeMorgan made many valuable contributions to  [#permalink]

Show Tags

New post 27 Sep 2018, 02:39
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).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

-
April 2018: New Forum dedicated to Verbal Strategies, Guides, and Resources

GMAT Club Bot
Re: Augustus DeMorgan made many valuable contributions to &nbs [#permalink] 27 Sep 2018, 02:39
Display posts from previous: Sort by

Augustus DeMorgan made many valuable contributions to

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.