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

It is currently 01 Aug 2015, 15:22
GMAT Club Tests

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

powers

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 21 Apr 2010
Posts: 7
Followers: 0

Kudos [?]: 3 [0], given: 6

powers [#permalink] New post 26 Apr 2010, 02:16
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 1 sessions
this is a question i got in my practise.. I will be writing ust the question and not the answer as i dont remember the answer and the options.

Please show how i can solve the question within 2 mins..

2+2+2+ 2^2 +2^3 +2^4+ 2^5 +2^6 +2^7+ 2^8+ 2^9
1 KUDOS received
Current Student
User avatar
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2799
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Followers: 198

Kudos [?]: 1185 [1] , given: 235

Reviews Badge
Re: powers [#permalink] New post 26 Apr 2010, 02:31
1
This post received
KUDOS
ITC wrote:
this is a question i got in my practise.. I will be writing ust the question and not the answer as i dont remember the answer and the options.

Please show how i can solve the question within 2 mins..

2+2+2+ 2^2 +2^3 +2^4+ 2^5 +2^6 +2^7+ 2^8+ 2^9


\(2+2+2+ 2^2 +2^3 +2^4+ 2^5 +2^6 +2^7+ 2^8+ 2^9
= 4+2+ 2^2 +2^3 +2^4+ 2^5 +2^6 +2^7+ 2^8+ 2^9\)

now\(2+ 2^2 +2^3 +2^4+ 2^5 +2^6 +2^7+ 2^8+ 2^9 i\)s the sum of GP series with a =2 ,r=2 n = 9

sum of series is =\(\frac{a(r^n -1)}{(r-1)}= \frac{2* (2^9 -1)}{(2-1)}\)
= \(2^{10} - 2\)
so required sum is =\(2^{10} - 2 +4 = 2^{10} +2\)
_________________

Fight for your dreams :For all those who fear from Verbal- lets give it a fight

Money Saved is the Money Earned :)

Jo Bole So Nihaal , Sat Shri Akaal

:thanks Support GMAT Club by putting a GMAT Club badge on your blog/Facebook :thanks

GMAT Club Premium Membership - big benefits and savings

Gmat test review :
670-to-710-a-long-journey-without-destination-still-happy-141642.html

Manager
Manager
avatar
Joined: 05 Mar 2010
Posts: 219
Followers: 1

Kudos [?]: 26 [0], given: 8

Re: powers [#permalink] New post 26 Apr 2010, 02:51
This can be written as 2+(2^2+2^2+2^3+............+2^9)
2^2+2^2 = 2^3
2^3+2^3 = 2^4
so on ..............2^9+2^9 = 2^10

we will be left with 2+2^10 - answer
_________________

Success is my Destiny

Re: powers   [#permalink] 26 Apr 2010, 02:51
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic Factorial Powers enigma123 5 26 Dec 2011, 10:29
1 Powers enigma123 6 26 Dec 2011, 10:19
3 Experts publish their posts in the topic Powers and Roots SonyGmat 11 17 Dec 2011, 11:21
1 Power Trouble jamifahad 7 18 Sep 2011, 05:13
Powers problem asch13 1 14 Jul 2010, 12:24
Display posts from previous: Sort by

powers

  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®.