It is currently 16 Jan 2018, 09:43

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If for integers a, b, c, and d, a + b + c + d = 4, does d =

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 23 Jun 2008
Posts: 140

Kudos [?]: 156 [0], given: 0

If for integers a, b, c, and d, a + b + c + d = 4, does d = [#permalink]

Show Tags

New post 22 Aug 2008, 14:45
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If for integers a, b, c, and d, a + b + c + d = 4, does d = 1?

(1) abc = 1
(2) ad = 1

Kudos [?]: 156 [0], given: 0

Intern
Intern
avatar
Joined: 20 Jul 2008
Posts: 22

Kudos [?]: 4 [0], given: 0

Re: PR Test 4:DS Question [#permalink]

Show Tags

New post 22 Aug 2008, 16:00
balboa wrote:
If for integers a, b, c, and d, a + b + c + d = 4, does d = 1?

(1) abc = 1
(2) ad = 1


Ans IMO C.
1 -> abc can be 111/1-1-1/-11-1/-1-11 accordingly d can be calculated.
2-> ad can be 11/-1-1

combine both: it has to be abcd = 1,1,1,1 adding upto 4.

Kudos [?]: 4 [0], given: 0

SVP
SVP
User avatar
Joined: 07 Nov 2007
Posts: 1790

Kudos [?]: 1123 [0], given: 5

Location: New York
Re: PR Test 4:DS Question [#permalink]

Show Tags

New post 22 Aug 2008, 19:13
balboa wrote:
If for integers a, b, c, and d, a + b + c + d = 4, does d = 1?

(1) abc = 1
(2) ad = 1



(1) abc = 1
to satisfy above a =b=c=1 or one of the is +1 other two must be -1
so
when all +1 d=1
when two of them -1 and other +1then d=5

insuffcient
2)ad = 1
possible only when a=-1 and d=-1 or a=d=1
insuffcient

combine both . all of them must be either +1 or -1

a + b + c + d = 4 is possible only when all of them must be positive.

a=b=c=d=1

suffcieint

C
_________________

Your attitude determines your altitude
Smiling wins more friends than frowning

Kudos [?]: 1123 [0], given: 5

Re: PR Test 4:DS Question   [#permalink] 22 Aug 2008, 19:13
Display posts from previous: Sort by

If for integers a, b, c, and d, a + b + c + d = 4, does d =

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| 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®.