GMAT Question of the Day - Daily to your Mailbox; hard ones only
close

It is currently 20 Aug 2019, 17:44
Register
GMAT Club Tests
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

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
CLICK HERE TO HIDE/SHOW EVENTS

If ab not equal to 0, then a^(-1) + b^(-1) =

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
  Sort by Date Sort by Kudos  
Search for:
 
Print view
First unread post
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Intern
Intern
avatar
B
Joined: 03 Apr 2019
Posts: 14
Location: United States (AZ)
Schools: Wharton Exec '23, W.P. Carey, Booth, Yale EMBA "22
GPA: 3.75
If ab not equal to 0, then a^(-1) + b^(-1) =  [#permalink]

Show Tags

New post Updated on: 06 Aug 2019, 00:05
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

92% (00:28) correct 8% (00:37) wrong based on 13 sessions

HideShow timer Statistics

If ab not equal to 0, then \(a^{-1} + b^{-1}=\)

A. a + b
B. -(a + b)
C. 1/(a + b)
D. 2/(a + b)
E. (a + b)/ab
Spoiler: OA

Originally posted by carbazzy on 05 Aug 2019, 13:24.
Last edited by Bunuel on 06 Aug 2019, 00:05, edited 2 times in total.
Renamed the topic and edited the question.
CEO
CEO
User avatar
V
Joined: 12 Sep 2015
Posts: 3912
Location: Canada
Re: If ab not equal to 0, then a^(-1) + b^(-1) =  [#permalink]

Show Tags

New post 05 Aug 2019, 13:32
1
Top Contributor
You might want to recheck your post.
I think you meant to write "a" instead of "2"

Cheers,
Brent
_________________
Test confidently with gmatprepnow.com
Image
Signature Read More
CEO
CEO
User avatar
V
Joined: 12 Sep 2015
Posts: 3912
Location: Canada
Re: If ab not equal to 0, then a^(-1) + b^(-1) =  [#permalink]

Show Tags

New post 05 Aug 2019, 13:38
2
Top Contributor
carbazzy wrote:
If ab not equal to 0, then \(a^-1 + b^-1\) =

a)a+b
b)-(a+b)
c)\(1/a+b\)
d)\(2/a+b\)
e)\(a+b/ab\)


Key concept: \(x^{-n}=\frac{1}{x^n}\)

\(a^{-1} + b^{-1} = \frac{1}{a}+\frac{1}{b}\)

\(= \frac{b}{ab}+\frac{a}{ab}\)

\(= \frac{b+a}{ab}\)

Answer: E

Cheers,
Brent
_________________
Test confidently with gmatprepnow.com
Image
Signature Read More
Manager
Manager
User avatar
S
Joined: 29 Jun 2019
Posts: 154
Re: If ab not equal to 0, then a^(-1) + b^(-1) =  [#permalink]

Show Tags

New post 05 Aug 2019, 13:41
a^-1=1/a
==》 1/a + 1/b=a+b/ ab
Option E

Posted from my mobile device
_________________
Always waiting
Signature Read More
Manager
Manager
avatar
G
Joined: 30 Sep 2017
Posts: 225
Concentration: Technology, Entrepreneurship
Schools: HBS '22, Stanford '22, Wharton '22
GMAT 1: 720 Q49 V40
GPA: 3.8
WE: Engineering (Real Estate)
Premium Member Reviews Badge
Game of Timers Top 25
Re: If ab not equal to 0, then a^(-1) + b^(-1) =  [#permalink]

Show Tags

New post 05 Aug 2019, 13:45
1/b + 1/a = (a + b) / ab

Answer is (E)

Posted from my mobile device
Intern
Intern
avatar
B
Joined: 03 Apr 2019
Posts: 14
Location: United States (AZ)
Schools: Wharton Exec '23, W.P. Carey, Booth, Yale EMBA "22
GPA: 3.75
Re: If ab not equal to 0, then a^(-1) + b^(-1) =  [#permalink]

Show Tags

New post 05 Aug 2019, 13:52
carbazzy wrote:
If ab not equal to 0, then \(a^-1 + b^-1\) =

a)a+b
b)-(a+b)
c)\(1/a+b\)
d)\(2/a+b\)
e)\(a+b/ab\)




Thanks so much for all the replies. Made a ton of silly mistakes today!
Manager
Manager
avatar
G
Joined: 30 Sep 2017
Posts: 225
Concentration: Technology, Entrepreneurship
Schools: HBS '22, Stanford '22, Wharton '22
GMAT 1: 720 Q49 V40
GPA: 3.8
WE: Engineering (Real Estate)
Premium Member Reviews Badge
Game of Timers Top 25
Re: If ab not equal to 0, then a^(-1) + b^(-1) =  [#permalink]

Show Tags

New post 05 Aug 2019, 14:02
carbazzy wrote:
carbazzy wrote:
If ab not equal to 0, then \(a^-1 + b^-1\) =

a)a+b
b)-(a+b)
c)\(1/a+b\)
d)\(2/a+b\)
e)\(a+b/ab\)




Thanks so much for all the replies. Made a ton of silly mistakes today!


Try this carbazzy

You will definitely enhance your quantitative skill. https://gmatclub.com/forum/a-4-b-3-16-h ... 02011.html

Posted from my mobile device
GMAT Club Bot
Re: If ab not equal to 0, then a^(-1) + b^(-1) =   [#permalink] 05 Aug 2019, 14:02
Print view
First unread post
Display posts from previous: Sort by

If ab not equal to 0, then a^(-1) + b^(-1) =

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: chetan2u, VeritasKarishma, Bunuel, Gladiator59, generis

Search for:





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions