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

It is currently 01 Aug 2015, 04:59
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

Number System- Divisibility

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 24 Jan 2010
Posts: 164
Location: India
Schools: ISB
Followers: 2

Kudos [?]: 32 [0], given: 14

Number System- Divisibility [#permalink] New post 26 Jun 2010, 01:18
If x is divisible by 42. Which of the following
numbers is definitely a factor of x2? (Choose
all that apply.)
a) 63 b) 33 c) 36 d) 8

It will be helpful if group can explain the answer as well.
_________________

_________________
If you like my post, consider giving me a kudos. THANKS!

2 KUDOS received
Manager
Manager
avatar
Joined: 16 Apr 2010
Posts: 222
Followers: 3

Kudos [?]: 66 [2] , given: 12

Re: Number System- Divisibility [#permalink] New post 26 Jun 2010, 21:00
2
This post received
KUDOS
x is divisible by 42 means x = 42k where k is any natural number different from 0.
so x = 42k = 2*3*7k
x2 = x*x = 2*2*3*3*7*7*k*k

63 = 9*7 is factor of x2
33 = 3*11 is not a factor of x2
36 = 4*9 is a factor of x2
8 is not a factor of x2

Hope the above explanation is clear.
Manager
Manager
avatar
Joined: 24 Jan 2010
Posts: 164
Location: India
Schools: ISB
Followers: 2

Kudos [?]: 32 [0], given: 14

Re: Number System- Divisibility [#permalink] New post 27 Jun 2010, 04:15
jakolik wrote:
x is divisible by 42 means x = 42k where k is any natural number different from 0.
so x = 42k = 2*3*7k
x2 = x*x = 2*2*3*3*7*7*k*k

63 = 9*7 is factor of x2
33 = 3*11 is not a factor of x2
36 = 4*9 is a factor of x2
8 is not a factor of x2

Hope the above explanation is clear.



Thanks for the explanation Jakolik.:) +1 Kudos
_________________

_________________
If you like my post, consider giving me a kudos. THANKS!

Re: Number System- Divisibility   [#permalink] 27 Jun 2010, 04:15
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic If x is a positive integer, is x divisible by vinnik 2 12 Jan 2013, 04:46
Experts publish their posts in the topic m12#23 - Number System ykaiim 5 12 Jun 2010, 05:24
m12#11 - Number System ykaiim 4 12 Jun 2010, 05:01
M13 System Issue unhedged 1 12 Aug 2008, 18:22
2 DS_divisibility m05 #36 IrinaOK 8 09 Oct 2007, 23:40
Display posts from previous: Sort by

Number System- Divisibility

  Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: WoundedTiger, Bunuel



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®.