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

It is currently 28 Aug 2014, 03:14

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

Which one of (a^-1+b^-1)^-1 and (a^-1*b^-1)^-1 is greater?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 10 Dec 2004
Posts: 274
Followers: 1

Kudos [?]: 15 [0], given: 0

GMAT Tests User
Which one of (a^-1+b^-1)^-1 and (a^-1*b^-1)^-1 is greater? [#permalink] New post 02 Feb 2005, 09:46
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Which one of (a^-1+b^-1)^-1 and (a^-1*b^-1)^-1 is greater?
1) a=2b
2) a+b>1
Manager
Manager
avatar
Joined: 11 Jan 2005
Posts: 101
Followers: 1

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

 [#permalink] New post 03 Feb 2005, 03:01
we simplify the expressions :

from (a^-1+b^-1)^-1
to ab/(a+b)

from (a^-1*b^-1)^-1
to ab

i. not sufficient if a=2b only
we have : (2/3) * b & 2b^2 if 0<b<1 & if b>1 gives different solutions

ii. not sufficient if a+b>1
ab can be negative or positive according to a or b, then we duno

together : if a+b>1 & a=2b then a & b are positive
but we still duno if a or b are between 0 & 1 then no sufficient


E
Manager
Manager
avatar
Joined: 24 Jan 2005
Posts: 217
Location: Boston
Followers: 1

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

GMAT Tests User
should be C [#permalink] New post 04 Feb 2005, 11:12
I just answered it somewhere in the forum.
Anirban
should be C   [#permalink] 04 Feb 2005, 11:12
    Similar topics Author Replies Last post
Similar
Topics:
Which one is greater on Richard’s farm: the total number of bekerman 4 28 Jan 2014, 19:58
3 Experts publish their posts in the topic In which one of the following choices must p be greater than carcass 11 15 Feb 2012, 10:19
which is greater raghavs 1 07 Apr 2010, 07:44
Experts publish their posts in the topic Which one has greater discount on dollar amount? Economist 8 05 Oct 2009, 08:49
1 One of my own problems Which is greater? 54^200 or Paul 4 08 Nov 2004, 18:40
Display posts from previous: Sort by

Which one of (a^-1+b^-1)^-1 and (a^-1*b^-1)^-1 is greater?

  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®.