1/ 2^10 + 1/ 2^11 + 1/ 2^12 + 1/ 2^13= : PS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 24 Jan 2017, 17:10

### 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

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

# 1/ 2^10 + 1/ 2^11 + 1/ 2^12 + 1/ 2^13=

Author Message
Eternal Intern
Joined: 07 Jun 2003
Posts: 467
Location: Lone Star State
Followers: 1

Kudos [?]: 144 [0], given: 0

1/ 2^10 + 1/ 2^11 + 1/ 2^12 + 1/ 2^13=  [#permalink]

### Show Tags

22 Jul 2003, 17:28
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.

1/ 2^10 + 1/ 2^11 + 1/ 2^12 + 1/ 2^13=

How to do this fast?
Manager
Joined: 07 Jul 2003
Posts: 56
Followers: 1

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

### Show Tags

22 Jul 2003, 18:17
Do you really need it???
Intern
Joined: 04 Jun 2003
Posts: 30
Location: california
Followers: 0

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

### Show Tags

22 Jul 2003, 18:33
Find the common denominator, which is 2^13.

then it would be (2^3+2^2+2+1)/2^13=15/2^13
Eternal Intern
Joined: 07 Jun 2003
Posts: 467
Location: Lone Star State
Followers: 1

Kudos [?]: 144 [0], given: 0

### Show Tags

22 Jul 2003, 19:22
Why is 2 ^13, the common denominator, I didn't get 47 on my GMAT, nor am I predicted to get one, but aiming for 40 +
SVP
Joined: 03 Feb 2003
Posts: 1603
Followers: 8

Kudos [?]: 245 [0], given: 0

### Show Tags

22 Jul 2003, 21:37
or take 2^10 as a common part

2^10 (1+1/2+1/4+1/8)=15/2^13
Intern
Joined: 04 Jun 2003
Posts: 30
Location: california
Followers: 0

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

### Show Tags

24 Jul 2003, 00:09
Curly,

2^13 is the common denominator because in this particular sequence, it is the largest number that is the multiple of the others.

For example, 1/2+1/4.... 4 is the common denominator when you add the fractions together: 2/4+1/4=3/4, and 4 is a multiple of 2.

Hope it helps.
24 Jul 2003, 00:09
Display posts from previous: Sort by

# 1/ 2^10 + 1/ 2^11 + 1/ 2^12 + 1/ 2^13=

 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®.