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

It is currently 20 Aug 2014, 21:04

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

GMATPrep2: Multiple of prime factors

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 20 Aug 2009
Posts: 108
Followers: 2

Kudos [?]: 39 [0], given: 31

GMATPrep2: Multiple of prime factors [#permalink] New post 03 Sep 2009, 02:36
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

33% (04:54) correct 67% (02:35) wrong based on 2 sessions
Don't know how to approach the first statement..

Image

OA
[Reveal] Spoiler:
B
1 KUDOS received
Current Student
avatar
Affiliations: ?
Joined: 20 Jul 2009
Posts: 191
Location: Africa/Europe
Schools: Kellogg; Ross ($$); Tuck
Followers: 2

Kudos [?]: 27 [1] , given: 6

Re: GMATPrep2: Multiple of prime factors [#permalink] New post 03 Sep 2009, 06:40
1
This post received
KUDOS
m can be written as this:
m = p^x*t^y where x and y are positives integers. (this is the decomposition of m as product of primes factors)

The question is asking if x>=2?

1) from this stament we can say that x+y > 9 : not sufficient

2) from this one: x > 3 sufficient
answer B
Manager
Manager
avatar
Joined: 10 Aug 2009
Posts: 130
Followers: 3

Kudos [?]: 53 [0], given: 10

Re: GMATPrep2: Multiple of prime factors [#permalink] New post 03 Sep 2009, 06:56
Since p and t are the only primes,
m=p^it^j where j>=1 and i>=1
If m is a multiple of p^2t, i>=2 and j>=1. Since we know that j>=1, we have only to prove that i>=2.

Statement 1

i\times j+1>9(note that generally the formula for the number of primes is (j+1)(i+1) but since we can elimintae all cases with i=0 or j=0, the formula is i\times j+1...1 is added since the case j=0 and i=0 can never eliminted )

Not sufficent
consider the case i=1 and j=9...not a multiple of p^2t

Statemet 2
sufficient since i=3 and m=p^3t^j where j>=1.
Manager
Manager
avatar
Joined: 25 Aug 2009
Posts: 177
Followers: 1

Kudos [?]: 59 [0], given: 12

GMAT Tests User
Re: GMATPrep2: Multiple of prime factors [#permalink] New post 03 Sep 2009, 15:02
madeinafrica wrote:
m can be written as this:
m = p^x*t^y where x and y are positives integers. (this is the decomposition of m as product of primes factors)

The question is asking if x>=2?

1) from this stament we can say that x+y > 9 : not sufficient

2) from this one: x > 3 sufficient
answer B


I liked the approach..good one..
Re: GMATPrep2: Multiple of prime factors   [#permalink] 03 Sep 2009, 15:02
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic Question Regarding Multiples, factors and primes! SonyGmat 6 09 Nov 2011, 15:11
1 Prime Factors DaveGG 1 12 Apr 2009, 07:59
1 Prime factors hibloom 2 18 Nov 2008, 08:46
Prime factor sandalphon 10 20 Dec 2005, 07:59
Display posts from previous: Sort by

GMATPrep2: Multiple of prime factors

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.