Last visit was: 21 Nov 2024, 06:43 It is currently 21 Nov 2024, 06:43

Close

GRE Prep 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 GRE 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.

Close

Request Expert Reply

Confirm Cancel
avatar
Manager
Manager
Joined: 12 Jan 2016
Posts: 142
Own Kudos [?]: 187 [2]
Given Kudos: 0
Send PM
avatar
Intern
Intern
Joined: 02 Jul 2016
Posts: 25
Own Kudos [?]: 17 [0]
Given Kudos: 0
Send PM
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Own Kudos [?]: 12195 [0]
Given Kudos: 136
Send PM
Manager
Manager
Joined: 10 Feb 2023
Posts: 76
Own Kudos [?]: 13 [0]
Given Kudos: 172
Send PM
Re: m < 0 < n [#permalink]
Hi Brent GreenlightTestPrep, I got D here. Not sure where did it go wrong?
Thanks Brent

m^(-1) - n^(-1)
1/m - 1/n
n-m/mn
multiply with mn and left with n-m
n=1, m=-1 > n-m = 0 = with B :0
n=2, m=-3 > n-m = 5 > B :0
So is D.
Verbal Expert
Joined: 18 Apr 2015
Posts: 29999
Own Kudos [?]: 36332 [0]
Given Kudos: 25923
Send PM
m < 0 < n [#permalink]
Expert Reply
I am not sure how you did manipulate

we do have \(\frac{1}{m} -\frac{1}{n}\)

\(\frac{n-m}{mn}\)

Now, iff you pick numbers such as m=-2 and n =1

we have

\(\frac{1+2}{-2*1}=\frac{2}{-2}=-1\) A will be always negative

B is the answer
Manager
Manager
Joined: 10 Feb 2023
Posts: 76
Own Kudos [?]: 13 [0]
Given Kudos: 172
Send PM
Re: m < 0 < n [#permalink]
Carcass wrote:
I am not sure how you did manipulate

we do have \(\frac{1}{m} -\frac{1}{n}\)

\(\frac{n-m}{mn}\)

Now, iff you pick numbers such as m=-2 and n =1

we have

\(\frac{1+2}{-2*1}=\frac{2}{-2}=-1\) A will be always negative

B is the answer


Thanks Carcass for your reply.
m < 0 < n , think I probably made the mistake here by taking m as positive here too of doing multiplication of mn to both side to elimiate it. That's why it has gone wrong.
Verbal Expert
Joined: 18 Apr 2015
Posts: 29999
Own Kudos [?]: 36332 [0]
Given Kudos: 25923
Send PM
Re: m < 0 < n [#permalink]
Expert Reply
You are doing careless mistakes that a student cannot afford when he/she takes the GRE test.

Be careful
Prep Club for GRE Bot
Re: m < 0 < n [#permalink]
Moderators:
GRE Instructor
83 posts
GRE Forum Moderator
37 posts
Moderator
1111 posts
GRE Instructor
234 posts

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