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

It is currently 01 Sep 2014, 10:49

Happy Labor Day:

Free Access to New GMATClub Tests for all GMATClub Members!!


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

Does PS include questions on sequences and series? Also,

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 04 Dec 2003
Posts: 4
Location: US
Followers: 0

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

Does PS include questions on sequences and series? Also, [#permalink] New post 05 Dec 2003, 08:32
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Does PS include questions on sequences and series?

Also, can someone help me with this one -
Q -What is the sum of reciprocal of first thirty positive integers?

Thx
Director
Director
User avatar
Joined: 28 Oct 2003
Posts: 503
Location: 55405
Followers: 1

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

GMAT Tests User
 [#permalink] New post 05 Dec 2003, 08:38
What is the sum of reciprocal of first thirty positive integers?

I don't know a shortcut to get the right answer, but if the question is multiple choice: I'd look at the answers, and if they're spaced widely enough, compute the sum of the first ten reciprocals + 10(1/15) +10(1/25).

I'm curious as to whether someone will have a more elegant and fast solution.
Intern
Intern
avatar
Joined: 04 Dec 2003
Posts: 4
Location: US
Followers: 0

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

 [#permalink] New post 05 Dec 2003, 08:47
Thanks!
This might sound silly but how did you get 10(1/50) and 10(1/25)?
Director
Director
User avatar
Joined: 28 Oct 2003
Posts: 503
Location: 55405
Followers: 1

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

GMAT Tests User
 [#permalink] New post 05 Dec 2003, 09:02
10(1/15) is an approximation of the sum of 1/11+1/12+1/13...+1/20
10(1/25) is an approximation of the sum of 1/21+1/22+1/23...+1/30

I just picked the midpoint.

Converting 1-10 to decimals (3 places) is easy if you have them memorized.
1+.5+.333+.25+.2+.167+.143+.125+.111+.1 =

2.92

+10/15 +10/25
+.667+.400

3.987, approximately...
Director
Director
User avatar
Joined: 28 Oct 2003
Posts: 503
Location: 55405
Followers: 1

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

GMAT Tests User
 [#permalink] New post 05 Dec 2003, 11:14
Per Microsoft Excel, the exact solution is
9304682830147/2329089562800

Or, in decimal form, 3.994987130920390

I learned that Excel has an LCM function.

Considering how much of my employer's time I just wasted, I am ashamed of myself.
  [#permalink] 05 Dec 2003, 11:14
    Similar topics Author Replies Last post
Similar
Topics:
DOES PRINCETON INCLUDE EXPERIMENTAL QUESTIONS IN ITS CAT soumyamalani 1 02 Aug 2011, 05:31
missing questions of PS and DS ( 1000 Series ) hirendhanak 0 24 Nov 2010, 00:06
Cultural question: Does base salary includes OT? asdert 3 06 Jan 2009, 04:54
PS: Series haas_mba07 3 06 Aug 2006, 19:32
Display posts from previous: Sort by

Does PS include questions on sequences and series? Also,

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.