Last visit was: 03 Jun 2026, 16:33 It is currently 03 Jun 2026, 16:33
Home
Messages
MBA Fair
Tests
Schools
Events
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
User avatar
salr15
User avatar
Joined: 03 Mar 2007
Last visit: 19 Jul 2011
Posts: 106
Own Kudos:
300
Posts: 106
Kudos: 300
GMATPrep 2: exponent problem 07 Jul 2007, 19:31
Kudos
Add Kudos
Bookmarks
Bookmark this Post


Please explain.



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
plaguerabbit
User avatar
Joined: 12 Apr 2007
Last visit: 06 Nov 2009
Posts: 76
Own Kudos:
29
Posts: 76
Kudos: 29
GMATPrep 2: exponent problem 07 Jul 2007, 19:37
Kudos
Add Kudos
Bookmarks
Bookmark this Post
= [(1000+1)^2 - (1000-1)^2] / [(100+1)^2 - (100-1)^2]

Distribute these and you'll get 4000/400 = 10

A
User avatar
sumande
User avatar
Joined: 04 Jun 2007
Last visit: 18 Oct 2012
Posts: 141
Own Kudos:
93
Posts: 141
Kudos: 93
GMATPrep 2: exponent problem 07 Jul 2007, 22:25
Kudos
Add Kudos
Bookmarks
Bookmark this Post
[1001^2 - 999^2] / [101^2 - 99^2]

= [(1001 + 999)*(1001 - 999)] / [(101 + 99) * (101 - 99)]

= [2000 * 2] / [200 * 2]

= 10 (A)
User avatar
ggarr
User avatar
Joined: 12 Jun 2006
Last visit: 20 Mar 2010
Posts: 263
Own Kudos:
852
Given Kudos: 1
Posts: 263
Kudos: 852
GMATPrep 2: exponent problem 08 Jul 2007, 03:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
plaguerabbit
= [(1000+1)^2 - (1000-1)^2] / [(100+1)^2 - (100-1)^2]

Distribute these and you'll get 4000/400 = 10

A
Show more
Will someone kindly work this out.
User avatar
KillerSquirrel
User avatar
Joined: 08 Jun 2005
Last visit: 28 Mar 2009
Posts: 520
Own Kudos:
649
Posts: 520
Kudos: 649
GMATPrep 2: exponent problem 08 Jul 2007, 07:30
Kudos
Add Kudos
Bookmarks
Bookmark this Post
ggarr
plaguerabbit
= [(1000+1)^2 - (1000-1)^2] / [(100+1)^2 - (100-1)^2]

Distribute these and you'll get 4000/400 = 10

A
Will someone kindly work this out.
Show more


(1,000+1)^2 = (1,000+1)(1,000+1) = 1,000^2+2,000+1

(1,000-1)^2 = (1,000-1)(1,000-1) = 1,000^2-2,000+1

1,000^2+2,000+1-(1,000^2-2,000+1) =

1,000^2+2,000+1-1,000^2+2,000-1 = 4000

and the same for the denominator

:-D



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!