Find all School-related info fast with the new School-Specific MBA Forum

It is currently 21 Oct 2014, 09:26

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Are all of the numbers in a certain list of 15 numbers

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 10 Nov 2010
Posts: 268
Location: India
Concentration: Strategy, Operations
GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21
WE: Information Technology (Computer Software)
Followers: 5

Kudos [?]: 56 [0], given: 22

Are all of the numbers in a certain list of 15 numbers [#permalink] New post 27 Jul 2011, 08:02
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

67% (01:45) correct 33% (00:50) wrong based on 12 sessions
133. Are all of the numbers in a certain list of 15 numbers
equal?
(1) The sum of all the numbers in the list is 60.
(2) The sum of any 3 numbers in the list is 12.

how option 2 is sufficient
[Reveal] Spoiler: OA

_________________

The proof of understanding is the ability to explain it.

Manager
Manager
avatar
Joined: 31 May 2011
Posts: 90
Location: India
Concentration: Finance, International Business
GMAT Date: 12-07-2011
GPA: 3.22
WE: Information Technology (Computer Software)
Followers: 1

Kudos [?]: 29 [0], given: 4

Re: Number Properties [#permalink] New post 27 Jul 2011, 08:19
GMATD11 wrote:
133. Are all of the numbers in a certain list of 15 numbers
equal?
(1) The sum of all the numbers in the list is 60.
(2) The sum of any 3 numbers in the list is 12.

how option 2 is sufficient


statement 1 is clearly insufficient as the some numbers could repeat and give more than one solution

Statement 2 is sufficient as it states that sum of any 3 numbers is 12.
i.e. is a1,a2,a3....a15 are the numbers then

a1+a5+a6 = a1+a3+a15= ....= 12
this is only sufficient when all the numbers are equal.

Hence B
Senior Manager
Senior Manager
avatar
Joined: 10 Nov 2010
Posts: 268
Location: India
Concentration: Strategy, Operations
GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21
WE: Information Technology (Computer Software)
Followers: 5

Kudos [?]: 56 [0], given: 22

Re: Number Properties [#permalink] New post 27 Jul 2011, 09:08
I didn't get how the

a1+a3+a5 =12

it can be 1+3+8
4+4+4
3+4+5

how statement two is sufficient
_________________

The proof of understanding is the ability to explain it.

Manager
Manager
avatar
Joined: 31 May 2011
Posts: 90
Location: India
Concentration: Finance, International Business
GMAT Date: 12-07-2011
GPA: 3.22
WE: Information Technology (Computer Software)
Followers: 1

Kudos [?]: 29 [0], given: 4

Re: Number Properties [#permalink] New post 27 Jul 2011, 10:57
GMATD11 wrote:
I didn't get how the

a1+a3+a5 =12

it can be 1+3+8
4+4+4
3+4+5

how statement two is sufficient


Its given in statement 2 that the sum of any 3 numbers is 12. In your case the numbers in the set can be 1,3,4,5,8,... as you have mentioned above. now taking any 3 numbers 4+5+8 not equal to 12 so it cannot be. The question says any 3 numbers shall add up to 12.

to be more clear think that its a matrix such that given below. Now the numbers should also add up to 12 when added vertically or diagonally.Now this will only be possible when all the numbers are same i.e. 4


a1+a2+a3 = 12
a3+a4+a5 = 12
a6+a7+a8 = 12
=============
12 12 12

Hope this clarifies.
Manager
Manager
avatar
Joined: 07 Jun 2011
Posts: 77
Followers: 0

Kudos [?]: 9 [0], given: 31

Re: Number Properties [#permalink] New post 29 Jul 2011, 01:56
I agree with the answer B. If the sum of any three numbers are equal, then all the numbers must be equal
Re: Number Properties   [#permalink] 29 Jul 2011, 01:56
    Similar topics Author Replies Last post
Similar
Topics:
1 Are all of the numbers in a certain list of 15 numbers tracyyahoo 5 31 Jul 2011, 03:10
Are all of the numbers in a certain list of 15 numbers equal ssr7 2 15 Apr 2011, 19:09
1 Experts publish their posts in the topic Are all of the numbers in a certain list of 15 numbers jpr200012 12 22 Sep 2010, 23:45
Are all of the numbers in a certain list of 15 numbers el1981 4 17 Feb 2008, 16:15
Are all of the numbers in a certain list of 15 numbers Folaa3 1 01 Jun 2005, 18:10
Display posts from previous: Sort by

Are all of the numbers in a certain list of 15 numbers

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.