It is currently 21 Feb 2018, 12:54

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

PS

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Intern
Joined: 02 Jan 2009
Posts: 15
PS [#permalink]

Show Tags

24 Feb 2009, 11:27
00:00

Difficulty:

(N/A)

Question Stats:

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

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Which of the following is closest in value to 9^9 – 9^2 ?

A.9^9
B.9^8
C.9^7
D.9^6
E.9^5
Director
Joined: 04 Jan 2008
Posts: 893
Re: PS [#permalink]

Show Tags

24 Feb 2009, 11:35
Its A-9^9

see ,
9^9-9^2=9^2((9^7) - 1)
~9^9
because 9^7 is too large compared to 1

janet1511 wrote:
Which of the following is closest in value to 9^9 – 9^2 ?

A.9^9
B.9^8
C.9^7
D.9^6
E.9^5

--
edited a small typo
_________________

http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Last edited by nitya34 on 25 Feb 2009, 22:09, edited 2 times in total.
VP
Joined: 05 Jul 2008
Posts: 1401
Re: PS [#permalink]

Show Tags

24 Feb 2009, 13:15
Agree with A

subtracting 81 makes it closer to 9 ^ 9 among the answer choices
Manager
Joined: 26 Dec 2008
Posts: 57
Schools: Booth (Admit R1), Sloan (Ding R1), Tuck (R1)
Re: PS [#permalink]

Show Tags

24 Feb 2009, 17:42
nitya34 wrote:
Its A-9^9

see ,
9^9-9^2=9^2((9^4.5) - 1)
~9^9
because 9^2 is too small compared to 9^9

Right approach but wrong equation

9^9-9^2 = 9^2(9^7 - 1)
~ 9^2*9^7 = 9^9
Intern
Joined: 07 Oct 2008
Posts: 12
Re: PS [#permalink]

Show Tags

24 Feb 2009, 18:47
agreed with the answer

9^2(9^7-1)

approx = 9^9
Director
Joined: 04 Jan 2008
Posts: 893
Re: PS [#permalink]

Show Tags

25 Feb 2009, 22:03
thanks
I corrected it
xyz21 wrote:
nitya34 wrote:
Its A-9^9

see ,
9^9-9^2=9^2((9^4.5) - 1)
~9^9
because 9^2 is too small compared to 9^9

Right approach but wrong equation

9^9-9^2 = 9^2(9^7 - 1)
~ 9^2*9^7 = 9^9

_________________

http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Manager
Joined: 26 Dec 2008
Posts: 57
Schools: Booth (Admit R1), Sloan (Ding R1), Tuck (R1)
Re: PS [#permalink]

Show Tags

25 Feb 2009, 22:46
1
This post received
KUDOS
nitya34 wrote:
thanks
I corrected it
xyz21 wrote:
nitya34 wrote:
Its A-9^9

see ,
9^9-9^2=9^2((9^4.5) - 1)
~9^9
because 9^2 is too small compared to 9^9

Right approach but wrong equation

9^9-9^2 = 9^2(9^7 - 1)
~ 9^2*9^7 = 9^9

happens to all of us
Re: PS   [#permalink] 25 Feb 2009, 22:46
Display posts from previous: Sort by

PS

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.