GPrep Ques

Expert replies

Previous Topic Next Topic

ranjeet75: Master | Next Rank: 500 Posts; Posts: 242; Joined: Fri Aug 01, 2008 8:49 am; Location: Delhi; Thanked: 6 times

by ranjeet75 » Sun May 13, 2012 7:01 am

Please provide explanation

Attachments

GPrep 1.docx: (392.56 KiB) Downloaded 105 times

Like this post

Source: Beat The GMAT — Problem Solving | Sun May 13, 2012 7:01 am

eagleeye: Legendary Member; Posts: 520; Joined: Sat Apr 28, 2012 9:12 pmFollowed by: 49 members; Thanked: 339 times; GMAT Score:770

by eagleeye » Sun May 13, 2012 6:04 pm

Hi Ranjeet75:

All can be true.
When evaluating questions like this keep in mind that fractional values become smaller when they are squared or quadrupled. The correct answer is all three. Let me give you specific examples.

For I:

Let x = 100, y = 5, z= 1; then y^2 = 25, z^4 = 1 and we have x>y^2>z^4 and x>y>z.
So I can be true.

For II:
Let x = 0.3 ; y = 0.4; z = 0.5 ; then y^2 = 0.16 ; z^4 = 0.0625 and we have x>y^2>z^4 and z>y>x.
So II can be true.

For III:
Let x= 100 ; y = 0.4 ; z = 0.5 ; then y^2 = 0.16 ; z^4 = 0.0625 and we have x>y^2>z^4 and x>z>y
So III can be true.

Hence the final answer is I, II, III

Like this post

GMAT/MBA Expert

Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Sun May 13, 2012 8:56 pm

ranjeet75 wrote:Please provide explanation

(I) x > y^2

Certainly for integer values of x and y, x is always greater than y. But what about fractional values> f y is a fraction then y^2 is < y. Now always there is a fraction x, such that y > x > y^2. Thus for fractional values x may be less than y. Therefore regarding the relation between x and y all of the options could be true.

(II) x > z^4

Same logic as above.

(II) y^2 > z^4

This directly implies y > z^2. Now again apply same logic as above.

The correct answer is E.

Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 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