Last visit was: 25 Apr 2026, 00:51 It is currently 25 Apr 2026, 00:51
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
amorica
User avatar
Joined: 13 Sep 2006
Last visit: 07 Oct 2011
Posts: 170
Own Kudos:
4
Posts: 170
Kudos: 4
Help w/ Exponents 02 Oct 2006, 19:24
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Can someone explain the quickest way to solve this?

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

sorry..but i forgot to write down the answers... but they were all in the form of 2^x



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
tennis1ball
User avatar
Joined: 25 Jun 2006
Last visit: 18 Mar 2008
Posts: 650
Own Kudos:
1,009
Posts: 650
Kudos: 1,009
Help w/ Exponents 02 Oct 2006, 19:39
Kudos
Add Kudos
Bookmarks
Bookmark this Post
2^9.

this has been posted before.

2^2 + 2^2 = 2^3
2^3 + 2^3 = 2^4,
so on..

u get 2^9.
avatar
jainvik7
avatar
Joined: 30 Jun 2006
Last visit: 28 Jul 2012
Posts: 52
Own Kudos:
27
Posts: 52
Kudos: 27
Help w/ Exponents 03 Oct 2006, 01:38
Kudos
Add Kudos
Bookmarks
Bookmark this Post
The terms are in GP.
First term 2 .
Common ratio is also 2.
User avatar
asaf
User avatar
Joined: 06 Sep 2006
Last visit: 07 Apr 2008
Posts: 292
Own Kudos:
200
Posts: 292
Kudos: 200
Help w/ Exponents 03 Oct 2006, 12:41
Kudos
Add Kudos
Bookmarks
Bookmark this Post
amorica
Can someone explain the quickest way to solve this?

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

sorry..but i forgot to write down the answers... but they were all in the form of 2^x
Show more


Since,

2^0 + 2^1 + 2^2 + ... + 2^n = 2^(n+1) -1

So,
1 + 2^0 + 2^1 + 2^2 + ... + 2^n = 2^(n+1) - 1 + 1

Ok then,
= 1 + 2^0 + 2^2 + ... + 2^8 = 2^(8+1) - 1 + 1
= 2^9



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!