Find all School-related info fast with the new School-Specific MBA Forum

It is currently 25 Dec 2014, 22:32

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

PS with series

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
User avatar
Joined: 07 Jun 2004
Posts: 618
Location: PA
Followers: 3

Kudos [?]: 221 [0], given: 22

PS with series [#permalink] New post 20 Nov 2006, 11:48
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
what is the quickest way to solve such problmes

and what is the answer to the below Q


1/2 + 1/2^2 + 1/2^3 ......... 1/ 2^10




thanks

rxs0005
Manager
Manager
avatar
Joined: 01 Oct 2006
Posts: 243
Followers: 1

Kudos [?]: 4 [0], given: 0

Re: PS with series [#permalink] New post 20 Nov 2006, 12:45
I use the geometric progression formula: a(1-r^(n+1))/ (1-r)

Eg for the above series; a = ½, r = ½

½(1-1/2^11)/1/2 = 1-(1/2^11) which is close to 1, but less than 1
VP
VP
User avatar
Joined: 25 Jun 2006
Posts: 1176
Followers: 2

Kudos [?]: 53 [0], given: 0

 [#permalink] New post 20 Nov 2006, 16:46
you should know this little thing:

1/2^n + 1/2^n = 1/2^(n-1).

so you just add a 1/2^10 at the back and subtract one.
then you get 1 - 1/2^10. :)
  [#permalink] 20 Nov 2006, 16:46
    Similar topics Author Replies Last post
Similar
Topics:
PS: Series bigfernhead 2 22 Apr 2009, 16:50
PS: series Economist 5 24 Mar 2009, 00:15
PS - Series mrsmarthi 1 18 Dec 2008, 11:26
1000 Series PS forgmat 1 31 May 2007, 19:49
PS: Series haas_mba07 3 06 Aug 2006, 19:32
Display posts from previous: Sort by

PS with series

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.