Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 21 May 2013, 18:58
Customize  |  Hide

Search
Register
New posts
Unanswered

1001^2)-(999^2)/(101^2)-(99^2) = 10 20 30 50 100

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Senior Manager
Senior Manager
Joined: 05 Oct 2008
Posts: 284
Followers: 3

Kudos [?]: 18 [0], given: 22

GMAT Tests User
1001^2)-(999^2)/(101^2)-(99^2) = 10 20 30 50 100 [#permalink] New post 24 Dec 2008, 03:57
(1001^2)-(999^2)/(101^2)-(99^2) =

10
20
30
50
100
1 KUDOS received
Director
Director
User avatar
Joined: 01 Apr 2008
Posts: 921
Followers: 8

Kudos [?]: 123 [1] , given: 18

GMAT Tests User
Re: Exponents [#permalink] New post 24 Dec 2008, 04:51
1
This post received
KUDOS
Simple solution: use the property a^2-b^2 = (a+b) (a-b)
=
(1001+999)(1001-999) / (101+99)(101-99)
=
(2000)(2) / (200)(2)
=
10

ans. A
Manager
Manager
Joined: 11 Apr 2008
Posts: 202
Followers: 2

Kudos [?]: 13 [0], given: 1

GMAT Tests User
Re: Exponents [#permalink] New post 24 Dec 2008, 08:22
Another alternative way

(a+b)^2-(a-b)^2=4ab

so the above can be expressed as
(1000+1)^2-(1000-1)^2/(100+1)^2-(100-1)^2
=4*1000/4*100
=10
_________________

Nobody dies a virgin, life screws us all.

Manager
Manager
Joined: 15 Apr 2008
Posts: 173
Followers: 2

Kudos [?]: 10 [0], given: 1

GMAT Tests User
Re: Exponents [#permalink] New post 24 Dec 2008, 10:59
subarao wrote:
Another alternative way

(a+b)^2-(a-b)^2=4ab

so the above can be expressed as
(1000+1)^2-(1000-1)^2/(100+1)^2-(100-1)^2
=4*1000/4*100
=10



i also used the same method. answer is 10
1 KUDOS received
Intern
Intern
Joined: 22 Dec 2008
Posts: 12
Followers: 0

Kudos [?]: 2 [1] , given: 0

Re: Exponents [#permalink] New post 24 Dec 2008, 13:04
1
This post received
KUDOS
I have just begun looking at an MBA. I am assuming we cannot use calculators on the exam? Correct? Incorrect?
Manager
Manager
Joined: 11 Apr 2008
Posts: 202
Followers: 2

Kudos [?]: 13 [0], given: 1

GMAT Tests User
Re: Exponents [#permalink] New post 24 Dec 2008, 22:08
username309. Forget about calculator. You are not allowed even with your watch or a tissue paper.
_________________

Nobody dies a virgin, life screws us all.

Manager
Manager
Joined: 21 Dec 2008
Posts: 80
Followers: 1

Kudos [?]: 24 [0], given: 0

Re: Exponents [#permalink] New post 28 Dec 2008, 07:14
no need of calculator...GMAT checks basics
Re: Exponents   [#permalink] 28 Dec 2008, 07:14
    Similar topics Author Replies Last post
Similar
Topics:
 New posts A shipment has 30 boxes. each is either 10lbs or 20lbs. damit 5 07 Sep 2004, 09:00
New posts An envelope contains 5, 10, 20 and 50 banknotes. If the kevincan 5 19 Jul 2006, 14:52
New posts What is the area of |x| + |y| = 10? 20 50 100 200 400 bmwhype2 6 02 Nov 2007, 13:04
New posts EXPERTS_POSTS_IN_THIS_TOPIC You have 6 sticks of lengths 10, 20, 30, 40, 50, and 60 sandal85 3 02 Jun 2012, 09:22
New posts 3 EXPERTS_POSTS_IN_THIS_TOPIC The average (arithmetic mean) of 10, 30, and 50 is 5 more Bunuel 5 01 Oct 2012, 05:05
Display posts from previous: Sort by

1001^2)-(999^2)/(101^2)-(99^2) = 10 20 30 50 100

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com