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

It is currently 01 Sep 2015, 06:32
GMAT Club Tests

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

Rephrasing of a DS question. Please help

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Director
Director
avatar
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 548
Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)
Followers: 2

Kudos [?]: 43 [0], given: 562

Rephrasing of a DS question. Please help [#permalink] New post 01 Nov 2012, 19:44
1
This post was
BOOKMARKED
if x is an integer greater than 1 and s is the sum of all the positive divisors of k , is s> k+1 ?

Source: GMATPrepNOW

This is rephrased as
Is k not prime?

I didn't understand the above rephrasing.. Please help.
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : end-of-my-gmat-journey-149328.html#p1197992

Kaplan Promo CodeKnewton GMAT Discount CodesVeritas Prep GMAT Discount Codes
Expert Post
3 KUDOS received
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 5863
Location: Pune, India
Followers: 1481

Kudos [?]: 7970 [3] , given: 190

Re: Rephrasing of a DS question. Please help [#permalink] New post 01 Nov 2012, 20:15
3
This post received
KUDOS
Expert's post
sachindia wrote:
if k is an integer greater than 1 and s is the sum of all the positive divisors of k , is s> k+1 ?

Source: GMATPrepNOW

This is rephrased as
Is k not prime?

I didn't understand the above rephrasing.. Please help.


k, a positive integer, will be prime if it has only two divisors - 1 and itself i.e. 1 and k. The sum s of divisors will be 1+k. e.g. prime number 7 has only two divisors 1 and 7. Sum s = 1+7 = 8
If k is not prime, it will definitely have at least one more divisor (in addition to 1 and k itself) and the sum s of divisors will be greater than 1+k. e.g. composite number 9 has 3 divisors: 1, 3, 9. Sum s = 1+3+9 = 13 which is greater than 1+9

The question: Is s > k+1
which translates to 'Is k composite?' or 'Is k not prime'
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Re: Rephrasing of a DS question. Please help   [#permalink] 01 Nov 2012, 20:15
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Teenagers are often priced out of the labor market by the government fresh 2 10 May 2015, 06:52
Experts publish their posts in the topic [CR Question] Please help answer sudhanshu631 5 14 Apr 2015, 23:52
Experts publish their posts in the topic need help on this syllogism question please! chiccufrazer1 3 13 Jan 2013, 11:57
Experts publish their posts in the topic please help me with this critical reasoning question chiccufrazer1 1 08 Jan 2013, 13:22
2 Experts publish their posts in the topic Please help me with this question jema08 5 15 Apr 2012, 16:33
Display posts from previous: Sort by

Rephrasing of a DS question. Please help

  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®.