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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 350,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Affiliations: CFA Institute (CFA Candiate), Canadian Institute of Chartered Accountants (CA Candiate), Chartered Alternative Investments Analysts Association (CAIA Candidate)

Re: If x and y are greater than 0, is x = 1 ? [#permalink]
14 Aug 2011, 09:05

cellydan wrote:

Why 2 isn't sufficient is that X or Y can also be fractions.

X = 1/2, Y = 2

XY = 1

You are not wrong, but check there are multiple values that x can take ? As per GMAC - All numbers are real numbers if not mentioned.

If X and Y are greater than 0, is x=1? Question gives : If X and Y are greater than 0. Question asks : Is X = 1? --> Yes/No (1) x/y = 1 Since y > 0 as per question stem, so x=y x > 0 , so x can take any value - 1,2,3,etc So 1 is not sufficient (2) xy = 1 If x is equal to 1, then y is equal to 1 If x is equal to 2, then y is equal to 1/2 If x is equal to 3, then y is equal to 1/3 All are valid, but there is no unique value of x. So (2) is not sufficient

Combining 1 and 2 - xy=1 and x=y \(XY = 1\) => \(x^2 = 1\) => \(x = +1 or -1\) But question tells x is greater than 1 So\(x = 1\)is the only value x can take.

Re: If x and y are greater than 0, is x = 1 ? [#permalink]
10 Sep 2011, 04:00

1

This post received KUDOS

1

This post was BOOKMARKED

DeeptiM wrote:

If x and y are greater than 0, is x=1?

1) x/y=1 2) xy=1

ST 1 x/y=1 and this means x=y so x and y can be 1 , 2, 3 , 4 , ....... EX : 5/5=1 4/4=1 1000/1000=1 NOT sufficient

ST2 xy=1 and means x=1/y so x can be 1/5 so y = 5 EX" 1/5 * 5 = 1 also not sufficient

ST1 & ST2 x=y and xy=1 you can simply find that xx=1 this means x^2 = 1 so x= +1 or x= -1 and because y and x must be larger than 0 so x must be +1 sufficient

the answer is C _________________

How can i lose my faith in life's fairness when i know that the dreams of those who sleep on the feathers are not more beautiful than the dreams of those who sleep on the ground? - Jubran Khaleel Jubran

Re: If x and y are greater than 0, is x = 1 ? [#permalink]
28 Sep 2014, 10:09

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

Re: If x and y are greater than 0, is x = 1 ? [#permalink]
05 Apr 2015, 06:30

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

How the growth of emerging markets will strain global finance : Emerging economies need access to capital (i.e., finance) in order to fund the projects necessary for...

Good news for globetrotting MBAs: travel can make you a better leader. A recent article I read espoused the benefits of traveling from a managerial perspective, stating that it...