GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 17 Jul 2018, 16:07

### 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

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

# Exponents!

Author Message
Manager
Affiliations: CFA L3 Candidate, Grad w/ Highest Honors
Joined: 03 Nov 2007
Posts: 129
Location: USA
Schools: Chicago Booth R2 (WL), Wharton R2 w/ int, Kellogg R2 w/ int
WE 1: Global Operations (Futures & Portfolio Financing) - Hedge Fund ($10bn+ Multi-Strat) WE 2: Investment Analyst (Credit strategies) - Fund of Hedge Fund ($10bn+ Multi-Strat)

### Show Tags

04 Aug 2009, 20:37
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

[1001^2 - 999^2] / [101^2 - 99^2]

10
20
40
80
100

I was able to make a intelligent guess and got lucky but I KNOW there is a trick to this. Anyone want to take a stab at it?

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
SVP
Joined: 30 Apr 2008
Posts: 1841
Location: Oklahoma City
Schools: Hard Knocks

### Show Tags

04 Aug 2009, 20:54
2
x^2 - y^2 = (x - y)(x + y) so...

$$\frac{(1001 - 999)(1001 + 999)}{(101-99)(101+99)}$$

now do the simple math

2*2000 / 2*200 = 4000/400 = 10

robertrdzak wrote:
[1001^2 - 999^2] / [101^2 - 99^2]

10
20
40
80
100

I was able to make a intelligent guess and got lucky but I KNOW there is a trick to this. Anyone want to take a stab at it?

_________________

------------------------------------
J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a.

GMAT Club Premium Membership - big benefits and savings

Intern
Joined: 29 Jul 2009
Posts: 14
Schools: Sauder,Cornell,McGill

### Show Tags

04 Aug 2009, 22:47
Thanks - you helped me refresh a long forgotten yet simple rule
_________________

~~RookieR~~

Out beyond ideas of wrongdoing and rightdoing, there is a field. I will meet you there

Senior Manager
Joined: 17 Jul 2009
Posts: 259
Concentration: Nonprofit, Strategy
GPA: 3.42
WE: Engineering (Computer Hardware)

### Show Tags

05 Aug 2009, 13:12
factorization works wonders!! =)
Manager
Joined: 18 Jul 2009
Posts: 166
Location: India
Schools: South Asian B-schools

### Show Tags

05 Aug 2009, 20:54
X^2 - y^2 = (x - y)(x + y) .....

[1001+999][1001-999] / [101+99][101-99]

2*2000 / 2*200 = 4000/400 = 10

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Bhushan S.
If you like my post....Consider it for Kudos

Re: Exponents!   [#permalink] 05 Aug 2009, 20:54
Display posts from previous: Sort by

# Exponents!

Moderators: chetan2u, KarishmaB, niks18, Bunuel

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne 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®.