can someone provide me with more info on this? i remember : Quant Question Archive [LOCKED]
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 18 Jan 2017, 17:25

### 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

# can someone provide me with more info on this? i remember

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
CEO
Joined: 21 Jan 2007
Posts: 2756
Location: New York City
Followers: 11

Kudos [?]: 851 [0], given: 4

can someone provide me with more info on this? i remember [#permalink]

### Show Tags

04 Oct 2007, 08:44
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

can someone provide me with more info on this? i remember learning this in high school but i look thru mgmat books and cannot find this concept.

Example

=5^k - 5^(k-1)
=5^k - (1/5)*5^k
CEO
Joined: 21 Jan 2007
Posts: 2756
Location: New York City
Followers: 11

Kudos [?]: 851 [0], given: 4

### Show Tags

04 Oct 2007, 08:52
=5^k - (1/5)*5^k
=5^k (1 - (1/5))
=5k*4/5
can we simplify the last step?
VP
Joined: 08 Jun 2005
Posts: 1146
Followers: 7

Kudos [?]: 189 [0], given: 0

### Show Tags

04 Oct 2007, 08:57
5^k - 5^(k-1)

lets assume k=3 then 5^3-5^2 = 125-25 = 100 hence:

5^k - 5^(k-1) = 5^(k-1)*(5-1) = 5^(k-1)*4

or lets assume k=3

5^k-1 = 5^k/5

since

5^3-1 = 5^3/5 = 125/5 = 25 = 5^3-1 = 5^2

04 Oct 2007, 08:57
Display posts from previous: Sort by

# can someone provide me with more info on this? i remember

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.