which one is true

Expert replies

mehrasa: Master | Next Rank: 500 Posts; Posts: 279; Joined: Fri Nov 05, 2010 5:43 pmFollowed by: 1 member; Thanked: 15 times

by mehrasa » Sun Sep 18, 2011 11:33 pm

if d>0 and 0<1-c/d<1 which one must be true?
I) c>0
II) c/d<1
III) c^2+ d^2>1

my Q is that how we can chk the third choice mathematically without picking No.

Last edited by mehrasa on Mon Sep 19, 2011 2:29 am, edited 1 time in total.

Like this post

Source: Beat The GMAT — Problem Solving | Sun Sep 18, 2011 11:33 pm

gmatclubmember: Master | Next Rank: 500 Posts; Posts: 158; Joined: Sat Sep 03, 2011 10:31 amFollowed by: 2 members; Thanked: 29 times

by gmatclubmember » Mon Sep 19, 2011 1:18 am

mehrasa wrote:if d>0 and 0<1-c/d<0 which one must be true?
I) c>0
II) c/d<1
III) c^2+ d^2>1

my Q is that how we can chk the third choice mathematically without picking No.

Please post the correct question since the second inequality seems to be incorrect. 0<x<0 ???

Cheers
Ami/-

Like this post

mehrasa: Master | Next Rank: 500 Posts; Posts: 279; Joined: Fri Nov 05, 2010 5:43 pmFollowed by: 1 member; Thanked: 15 times

by mehrasa » Mon Sep 19, 2011 2:08 am

hey Ami
I can not see anything wrong here to correct..this is the exact question...

Last edited by mehrasa on Mon Sep 19, 2011 2:29 am, edited 1 time in total.

Like this post

excavator: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Mon Sep 19, 2011 12:30 am

by excavator » Mon Sep 19, 2011 2:10 am

Hi..

How is it possible 0<1-c/d<0.
Could you please rectify

Like this post

GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Mon Sep 19, 2011 2:39 am

I posted a solution here:

https://www.beatthegmat.com/official-gma ... 85301.html

Algebra is often the most efficient way to prove that a statement MUST be true.
To prove that a statement DOESN'T have to be true, picking numbers is usually faster. All you need is ONE combination of numbers for which the statement is not true.

Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

559 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review