NEW HERE? LEARN MORE
closeclose
Last visit was: 23 Apr 2024, 17:24 It is currently 23 Apr 2024, 17:24
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

X and Y are different prime numbers. How many factors does

User avatar
joemama142000
Director
Director
Joined: 17 Oct 2005
Posts: 645
Own Kudos [?]: 1579 [0]
Given Kudos: 0
Send PM
X and Y are different prime numbers. How many factors does [#permalink] New post   21 Feb 2006, 16:50
X and Y are different prime numbers. How many factors does XY^2 have?



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
ps_dahiya
VP
VP
Joined: 20 Nov 2005
Posts: 1490
Own Kudos [?]: 1133 [0]
Given Kudos: 0
Concentration: Strategy, Entrepreneurship
Schools:Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
 Q50  V34
Send PM
Re: X and Y are different prime numbers. How many factors does [#permalink] New post   21 Feb 2006, 19:14
6

1, X, Y, Y^2, XY, XY^2
User avatar
ywilfred
SVP
SVP
Joined: 07 Jul 2004
Posts: 2004
Own Kudos [?]: 1899 [0]
Given Kudos: 0
Location: Singapore
Send PM
Re: X and Y are different prime numbers. How many factors does [#permalink] New post   21 Feb 2006, 19:47
Assume X and Y are 3 and 5.

Then XY^2 = (35)(35)

Factors are = 1,3,5,9,15,25,45,75,225

# of factors = 9
User avatar
ps_dahiya
VP
VP
Joined: 20 Nov 2005
Posts: 1490
Own Kudos [?]: 1133 [0]
Given Kudos: 0
Concentration: Strategy, Entrepreneurship
Schools:Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
 Q50  V34
Send PM
Re: X and Y are different prime numbers. How many factors does [#permalink] New post   21 Feb 2006, 19:55
ywilfred wrote:
Assume X and Y are 3 and 5.

Then XY^2 = (35)(35)

Factors are = 1,3,5,9,15,25,45,75,225

# of factors = 9


I think you read it incorrectly. In your approach if we assume X and Y as 2 and 3 then

XY^2 = (23)(23) or (32)(32) in this case factors can not be determined.

But I think question says X and Y are different prime numbers, (may be one digit or multiple digits). Then we have to find factors of X * Y^2.

Am I right joemama??
User avatar
joemama142000
Director
Director
Joined: 17 Oct 2005
Posts: 645
Own Kudos [?]: 1579 [0]
Given Kudos: 0
Send PM
Re: X and Y are different prime numbers. How many factors does [#permalink] New post   21 Feb 2006, 20:15
you are right psd, the oa is 6
User avatar
ywilfred
SVP
SVP
Joined: 07 Jul 2004
Posts: 2004
Own Kudos [?]: 1899 [0]
Given Kudos: 0
Location: Singapore
Send PM
Re: X and Y are different prime numbers. How many factors does [#permalink] New post   21 Feb 2006, 20:25
joemama142000 wrote:
you are right psd, the oa is 6


I think I read it as (XY)^2 :oops:
User avatar
razrulz
Manager
Manager
Joined: 11 Jan 2006
Posts: 99
Own Kudos [?]: 12 [0]
Given Kudos: 0
Location: Chennai,India
Send PM
Re: X and Y are different prime numbers. How many factors does [#permalink] New post   21 Feb 2006, 21:54
ywilfred wrote:
Assume X and Y are 3 and 5.

Then XY^2 = (35)(35)

Factors are = 1,3,5,9,15,25,45,75,225

# of factors = 9


Even in this case, arnt factor are numbers which divide the integer which it factorises? , how can 35 be divided by 9 ? :roll: . with my exam tomorrow i am getting confused
User avatar
jlui4477
Manager
Manager
Joined: 08 Feb 2006
Posts: 64
Own Kudos [?]: 46 [0]
Given Kudos: 0
Send PM
Re: X and Y are different prime numbers. How many factors does [#permalink] New post   23 Feb 2006, 00:38
If x is 2 and y is 5 then 25^2 is 625. The factors I got was 1, 25, 625, 5, 125. It is not divisible by x. I only got 5 factors? :x
User avatar
joemama142000
Director
Director
Joined: 17 Oct 2005
Posts: 645
Own Kudos [?]: 1579 [0]
Given Kudos: 0
Send PM
Re: X and Y are different prime numbers. How many factors does [#permalink] New post   23 Feb 2006, 01:03
jlui4477 wrote:
If x is 2 and y is 5 then 25^2 is 625. The factors I got was 1, 25, 625, 5, 125. It is not divisible by x. I only got 5 factors? :x


anything muliplied by 2 is even



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: X and Y are different prime numbers. How many factors does [#permalink]
23 Feb 2006, 01:03
Moderator:
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions