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

It is currently 18 Apr 2014, 11:01

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

Adding exponents

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
Joined: 08 Jul 2009
Posts: 6
Followers: 0

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

Adding exponents [#permalink] New post 30 Jul 2009, 17:56
I'm sure this question has been asked, but it's hard to search for:

2^1 +2^1 +2^2+ 2^3 + 2^4 + 2^5 + 2^6 + 2^7 + 2^8 =

I'm having trouble factoring it out.

Thank you!
1 KUDOS received
Manager
Manager
Joined: 10 Jul 2009
Posts: 172
Followers: 1

Kudos [?]: 24 [1] , given: 8

GMAT Tests User
Re: Adding exponents [#permalink] New post 30 Jul 2009, 18:28
1
This post received
KUDOS
2^1 +2^1 +2^2+ 2^3 + 2^4 + 2^5 + 2^6 + 2^7 + 2^8

2^1 +2^1 = 2*2^1 = 2^2
2^2 + 2^2 = 2*2^2 = 2^3

So 2^1 +2^1 +2^2 form 2^3
Similarly 2^1 +2^1 +2^2+ 2^3 + 2^4 + 2^5 + 2^6 + 2^7 + 2^8 is equal to 2^9
Intern
Intern
Status: Applying
Joined: 30 Jul 2009
Posts: 39
Followers: 0

Kudos [?]: 4 [0], given: 3

Re: Adding exponents [#permalink] New post 31 Jul 2009, 11:43
[EDIT - REMOVED BY USER]

Last edited by nplaneta on 17 Jun 2012, 16:39, edited 1 time in total.
Intern
Intern
Joined: 08 Jul 2009
Posts: 6
Followers: 0

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

Re: Adding exponents [#permalink] New post 31 Jul 2009, 15:47
Excellent, thank you!
Manager
Manager
Joined: 02 Oct 2010
Posts: 159
Followers: 2

Kudos [?]: 1 [0], given: 29

GMAT Tests User
Re: Adding exponents [#permalink] New post 01 Jan 2011, 22:00
nplaneta wrote:
Aleehsgonji wrote:
2^1 +2^1 +2^2+ 2^3 + 2^4 + 2^5 + 2^6 + 2^7 + 2^8

2^1 +2^1 = 2*2^1 = 2^2
2^2 + 2^2 = 2*2^2 = 2^3

So 2^1 +2^1 +2^2 form 2^3
Similarly 2^1 +2^1 +2^2+ 2^3 + 2^4 + 2^5 + 2^6 + 2^7 + 2^8 is equal to 2^9



I was stumped by this as well. Great explaination. Kudos to you.


Very Nice Explanation..
U have made it so very precise and clear..
Intern
Intern
Joined: 19 Oct 2011
Posts: 1
Followers: 0

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

GMAT Tests User
Re: Adding exponents [#permalink] New post 22 Oct 2011, 01:24
Thanks a lot. It. Looks so easy now!
Intern
Intern
Joined: 19 Oct 2011
Posts: 17
GMAT 1: 790 Q51 V50
GPA: 3.93
Followers: 1

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

Re: Adding exponents [#permalink] New post 27 Oct 2011, 20:37
Alternate solution (not really practical here but maybe in a similar problem?):

2^1 +2^1 +2^2+ 2^3 + 2^4 + 2^5 + 2^6 + 2^7 + 2^8 = ?

Represented in binary:

0000000010 +
0000000010 +
0000000100 +
0000001000 +
0000010000 +
0000100000 +
0001000000 +
0010000000 +
0100000000 =
----------------
1000000000

I've just started my GMAT prep recently so feel free to disregard if this doesn't sound helpful, but changing bases can be helpful sometimes =]
Re: Adding exponents   [#permalink] 27 Oct 2011, 20:37
    Similar topics Author Replies Last post
Similar
Topics:
New posts exponent cavanbas 1 11 Jan 2005, 19:30
New posts Exponents tomgw 4 28 Sep 2005, 03:31
New posts Ads ashkrs 1 02 Sep 2007, 07:13
New posts Adding exponents - Easy but its teasing my brain djdela 7 22 Jul 2008, 15:18
New posts 1 Experts publish their posts in the topic Adding exponents with the same base hitman5532 6 15 Jan 2013, 15:18
Display posts from previous: Sort by

Adding exponents

  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®.