It is currently 20 Oct 2017, 04:06

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

c and d are intigers is c even?? 1) c(d+1) = even 2)

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
SVP
SVP
User avatar
B
Joined: 05 Jul 2006
Posts: 1750

Kudos [?]: 430 [0], given: 49

GMAT ToolKit User
c and d are intigers is c even?? 1) c(d+1) = even 2) [#permalink]

Show Tags

New post 20 Sep 2008, 10:18
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

c and d are intigers is c even??

1) c(d+1) = even
2) (c+2)(d+4) = even

Kudos [?]: 430 [0], given: 49

Director
Director
avatar
Joined: 23 Sep 2007
Posts: 782

Kudos [?]: 236 [0], given: 0

Re: even and odd intigers [#permalink]

Show Tags

New post 20 Sep 2008, 13:58
yezz wrote:
c and d are intigers is c even??

1) c(d+1) = even
2) (c+2)(d+4) = even



C
statement 1: cd + C = even, insuff
statement 2: 4c + 2d + cd + 8 = even, insuff

together: subtract statement 1 from 2 to get 3c + 2d + 8 = even

2d + 8 must be even, so 3c must also be even, so c is even

Kudos [?]: 236 [0], given: 0

VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1402

Kudos [?]: 437 [0], given: 1

Re: even and odd intigers [#permalink]

Show Tags

New post 20 Sep 2008, 14:06
gmatnub wrote:
yezz wrote:
c and d are intigers is c even??

1) c(d+1) = even
2) (c+2)(d+4) = even



A
statement 1: cd + C = even, c must be even



wrong sum of either two evens or two odds can be even C can be odd too

C (d+1) is even means either one of them is even or both. ( Y and N ) Insuff

(C+2) (D+4) is even means either one of them is even or both. ( Y and N ) Insuff

Combine both Still the same. Hence E

Kudos [?]: 437 [0], given: 1

Senior Manager
Senior Manager
avatar
Joined: 31 Jul 2008
Posts: 290

Kudos [?]: 55 [0], given: 0

Re: even and odd intigers [#permalink]

Show Tags

New post 20 Sep 2008, 14:09
C

from 1 c can be odd / even

Kudos [?]: 55 [0], given: 0

VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1402

Kudos [?]: 437 [0], given: 1

Re: even and odd intigers [#permalink]

Show Tags

New post 20 Sep 2008, 14:12
gmatnub wrote:
yezz wrote:
c and d are intigers is c even??

1) c(d+1) = even
2) (c+2)(d+4) = even



C
statement 1: cd + C = even, insuff
statement 2: 4c + 2d + cd + 8 = even, insuff

together: subtract statement 1 from 2 to get 3c + 2d + 8 = even

2d + 8 must be even, so 3c must also be even, so c is even


Yeppers! You nailed it.

Kudos [?]: 437 [0], given: 1

Intern
Intern
avatar
Joined: 02 Sep 2008
Posts: 45

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

Re: even and odd intigers [#permalink]

Show Tags

New post 20 Sep 2008, 19:05
Yep,

C is the answer.

St1: either C or D+1 is even.

St2: either C+2 or D+4 is even.

combining both, D+1 and D+4 both can't be even at one time but C and C+2 has to be even as multiplication is even.

Hence. C is even. and C is the answer

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

VP
VP
User avatar
Joined: 30 Jun 2008
Posts: 1034

Kudos [?]: 707 [0], given: 1

Re: even and odd intigers [#permalink]

Show Tags

New post 20 Sep 2008, 22:03
Great approaches both Twoone and gmatnub !!
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Kudos [?]: 707 [0], given: 1

VP
VP
avatar
Joined: 17 Jun 2008
Posts: 1374

Kudos [?]: 406 [0], given: 0

Re: even and odd intigers [#permalink]

Show Tags

New post 20 Sep 2008, 22:26
yezz wrote:
c and d are intigers is c even??

1) c(d+1) = even
2) (c+2)(d+4) = even

Clearly C

1) says c=even,d=odd
c=odd,d=odd
c=even,d=even
c can be even or odd

2)c=even,d=odd
c=odd,d=even
c=even,d=even

INSUFFI c =even or odd

again combining both we get c=even and d=odd
HENCE SUFFI
IMO C
_________________

cheers
Its Now Or Never

Kudos [?]: 406 [0], given: 0

Re: even and odd intigers   [#permalink] 20 Sep 2008, 22:26
Display posts from previous: Sort by

c and d are intigers is c even?? 1) c(d+1) = even 2)

  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®.