It is currently 18 Jan 2018, 19:57

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Is the point (x,y) in the fourth quadrant?

Author Message
TAGS:

### Hide Tags

Intern
Joined: 05 Oct 2009
Posts: 32

Kudos [?]: 15 [4], given: 14

Location: Hamamatsu, Japan
Schools: Attending IE Nov 2010
WE 1: 11 years int'l work experience

### Show Tags

06 Oct 2009, 18:26
4
KUDOS
00:00

Difficulty:

55% (hard)

Question Stats:

54% (00:36) correct 46% (00:24) wrong based on 110 sessions

### HideShow timer Statistics

Is the point (x,y) in the fourth quadrant)?

(1) xy >0
(2) y > 0

I recently took a practice test with my iPhone software (GMAT Math ver 1.1) and got a question I don't altogether agree with. Can someone help me out here?

The software says 1 alone is sufficient, but I think you need both.
My reasoning is that x could be -2 and y=-2, in that case, xy = 4 > 0. That would put the point in the 3rd quadrant while 2,2 would also fulfill that and put it in the 1st quad. Therefore 1 alone shouldn't be enough to be conclusive.

thanks for any insights...
[Reveal] Spoiler: OA

Last edited by Bunuel on 23 Nov 2017, 22:59, edited 3 times in total.

Kudos [?]: 15 [4], given: 14

Math Expert
Joined: 02 Sep 2009
Posts: 43322

Kudos [?]: 139442 [1], given: 12790

### Show Tags

06 Oct 2009, 18:41
1
KUDOS
Expert's post
Jones105 wrote:
I recently took a practice test with my iPhone software (GMAT Math ver 1.1) and got a question I don't altogether agree with. Can someone help me out here?

DS Question:
Is the point (x,y) in the fourth quadrant)?
1) xy >0
2) y > 0

The software says 1 alone is sufficient, but I think you need both.
My reasoning is that x could be -2 and y=-2, in that case, xy = 4 > 0. That would put the point in the 3rd quadrant while 2,2 would also fulfill that and put it in the 1st quad. Therefore 1 alone shouldn't be enough to be conclusive.

thanks for any insights...

Is the point (x,y) in the fourth quadrant)?

This is yes/no DS problem. In the 4th quadrant y is negative and x is positive, so xy < 0.

(1) xy > 0 --> x and y have the same signs --> the point is either in I or III in quadrant, so you can answer the question "Is the point (x,y) in the fourth quadrant" - NO. Sufficient.

(2) y > 0 --> the point is either in I or in II quadrant. Again Sufficient to answer the question: No it's not in 4th quadrant. Sufficient

Does your software say the answer is A? If so it's not right. Answer is D each alone is sufficient.
_________________

Kudos [?]: 139442 [1], given: 12790

Senior Manager
Joined: 18 Aug 2009
Posts: 317

Kudos [?]: 361 [0], given: 13

### Show Tags

06 Oct 2009, 18:49
D.

1) x and y, both either negative or positive. Sufficient.
2) y is positive, that means, (x,y) either can be in first or second quadrant. Sufficient.

If answer is A, then it is WRONG!

Kudos [?]: 361 [0], given: 13

Intern
Joined: 05 Oct 2009
Posts: 32

Kudos [?]: 15 [0], given: 14

Location: Hamamatsu, Japan
Schools: Attending IE Nov 2010
WE 1: 11 years int'l work experience

### Show Tags

06 Oct 2009, 19:37
Ahh, I missed the trees for the forest.

You're right, being in 1 or 3 would in fact negate the possibility of being in 4. I was thinking in terms of, is it sufficient to determine what quadrant it's in.

Muchas Gracias!

Kudos [?]: 15 [0], given: 14

Intern
Joined: 05 Oct 2009
Posts: 32

Kudos [?]: 15 [0], given: 14

Location: Hamamatsu, Japan
Schools: Attending IE Nov 2010
WE 1: 11 years int'l work experience

### Show Tags

06 Oct 2009, 19:45
Yes, the software says 1 alone is sufficient. So it does appear to be wrong.

However, this brings up another question. What happens when x or y = 0? What quadrant does that put it in? Both? Neither?

Kudos [?]: 15 [0], given: 14

Founder
Joined: 04 Dec 2002
Posts: 16318

Kudos [?]: 30003 [0], given: 5457

Location: United States (WA)
GMAT 1: 750 Q49 V42

### Show Tags

06 Oct 2009, 19:49
Thanks! Let me look into this.
_________________

Founder of GMAT Club

Just starting out with GMAT? Start here... or use our Daily Study Plan

Co-author of the GMAT Club tests

Kudos [?]: 30003 [0], given: 5457

Senior Manager
Joined: 18 Aug 2009
Posts: 317

Kudos [?]: 361 [0], given: 13

### Show Tags

06 Oct 2009, 20:12
Jones105 wrote:
Muchas Gracias!

Jones105 wrote:
However, this brings up another question. What happens when x or y = 0? What quadrant does that put it in? Both? Neither?

Neither, it is 'Origin' and not lie in any quadrant, but lies on the X and Y axis itself.

Kudos [?]: 361 [0], given: 13

CIO
Joined: 02 Oct 2007
Posts: 1216

Kudos [?]: 1000 [0], given: 334

### Show Tags

07 Oct 2009, 00:48
Yes, there is an error. I guess we'll have to change S2 to
2) $$y \lt 0$$
We won't have the problem then. What do you guys think? Sorry about the error.
_________________

Welcome to GMAT Club!

Want to solve GMAT questions on the go? GMAT Club iPhone app will help.
Result correlation between real GMAT and GMAT Club Tests
Are GMAT Club Test sets ordered in any way?

Take 15 free tests with questions from GMAT Club, Knewton, Manhattan GMAT, and Veritas.

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 1000 [0], given: 334

Intern
Joined: 05 Oct 2009
Posts: 32

Kudos [?]: 15 [0], given: 14

Location: Hamamatsu, Japan
Schools: Attending IE Nov 2010
WE 1: 11 years int'l work experience

### Show Tags

07 Oct 2009, 05:25
Ahh, so the developers of the software hang out at gmatclub, eh?

Surely, I'll be receiving some major kudos for spotting a bug in the software...

Kudos [?]: 15 [0], given: 14

CIO
Joined: 02 Oct 2007
Posts: 1216

Kudos [?]: 1000 [0], given: 334

### Show Tags

07 Oct 2009, 05:45
Thank you for spotting it. You got a Kudos from me. +1.
Jones105 wrote:
Ahh, so the developers of the software hang out at gmatclub, eh?

Surely, I'll be receiving some major kudos for spotting a bug in the software...

_________________

Welcome to GMAT Club!

Want to solve GMAT questions on the go? GMAT Club iPhone app will help.
Result correlation between real GMAT and GMAT Club Tests
Are GMAT Club Test sets ordered in any way?

Take 15 free tests with questions from GMAT Club, Knewton, Manhattan GMAT, and Veritas.

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 1000 [0], given: 334

Intern
Joined: 05 Oct 2009
Posts: 32

Kudos [?]: 15 [0], given: 14

Location: Hamamatsu, Japan
Schools: Attending IE Nov 2010
WE 1: 11 years int'l work experience

### Show Tags

07 Oct 2009, 06:13
Thanks!
If I have any other questions as I use the software, should I PM you, or start a new thread somewhere? I'm sure most of the time it will just be my oversights.

Kudos [?]: 15 [0], given: 14

CIO
Joined: 02 Oct 2007
Posts: 1216

Kudos [?]: 1000 [0], given: 334

### Show Tags

07 Oct 2009, 06:24
Feel free to PM me or BB regarding this software. Thank you.
Jones105 wrote:
Thanks!
If I have any other questions as I use the software, should I PM you, or start a new thread somewhere? I'm sure most of the time it will just be my oversights.

_________________

Welcome to GMAT Club!

Want to solve GMAT questions on the go? GMAT Club iPhone app will help.
Result correlation between real GMAT and GMAT Club Tests
Are GMAT Club Test sets ordered in any way?

Take 15 free tests with questions from GMAT Club, Knewton, Manhattan GMAT, and Veritas.

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 1000 [0], given: 334

CEO
Joined: 17 Nov 2007
Posts: 3583

Kudos [?]: 4795 [0], given: 360

Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

### Show Tags

07 Oct 2009, 08:10
+1 from me also
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

Kudos [?]: 4795 [0], given: 360

Founder
Joined: 04 Dec 2002
Posts: 16318

Kudos [?]: 30003 [0], given: 5457

Location: United States (WA)
GMAT 1: 750 Q49 V42

### Show Tags

07 Oct 2009, 19:15
Jones105 wrote:
I recently took a practice test with my iPhone software (GMAT Math ver 1.1) and got a question I don't altogether agree with. Can someone help me out here?

DS Question:
Is the point (x,y) in the fourth quadrant)?
1) xy >0
2) y > 0

The software says 1 alone is sufficient, but I think you need both.
My reasoning is that x could be -2 and y=-2, in that case, xy = 4 > 0. That would put the point in the 3rd quadrant while 2,2 would also fulfill that and put it in the 1st quad. Therefore 1 alone shouldn't be enough to be conclusive.

thanks for any insights...

Jones - can you tell me the question number in the GMAT Club App?
I am not able to locate this question - are you sure it is from our Application?
_________________

Founder of GMAT Club

Just starting out with GMAT? Start here... or use our Daily Study Plan

Co-author of the GMAT Club tests

Kudos [?]: 30003 [0], given: 5457

Founder
Joined: 04 Dec 2002
Posts: 16318

Kudos [?]: 30003 [0], given: 5457

Location: United States (WA)
GMAT 1: 750 Q49 V42

### Show Tags

07 Oct 2009, 22:51
I also looked through the Veritas app - can't find it there either...
_________________

Founder of GMAT Club

Just starting out with GMAT? Start here... or use our Daily Study Plan

Co-author of the GMAT Club tests

Kudos [?]: 30003 [0], given: 5457

Intern
Joined: 05 Oct 2009
Posts: 32

Kudos [?]: 15 [0], given: 14

Location: Hamamatsu, Japan
Schools: Attending IE Nov 2010
WE 1: 11 years int'l work experience

### Show Tags

08 Oct 2009, 00:01
Hah,
I guess before we all get carried away, we should probably make sure we're talking about the same software, eh?

As I said above, I'm using GMAT MATH version 1.1 by Indriam Inc.

I just searched the app Store (I'm in Japan using a US account) for "gmat math" and it was the second result, labeled as GMAT Math Review for $2.99 by Indriam Inc. I took the mini Test (19 questions) and it was question number 17 in that test, but I'm guessing it's different each time? So, are talking about the same software? Kudos [?]: 15 [0], given: 14 Founder Joined: 04 Dec 2002 Posts: 16318 Kudos [?]: 30003 [0], given: 5457 Location: United States (WA) GMAT 1: 750 Q49 V42 Re: Is the point (x,y) in the fourth quadrant? [#permalink] ### Show Tags 08 Oct 2009, 00:02 Jones105 wrote: Hah, I guess before we all get carried away, we should probably make sure we're talking about the same software, eh? As I said above, I'm using GMAT MATH version 1.1 by Indriam Inc. I just searched the app Store (I'm in Japan using a US account) for "gmat math" and it was the second result, labeled as GMAT Math Review for$2.99 by Indriam Inc.

I took the mini Test (19 questions) and it was question number 17 in that test, but I'm guessing it's different each time?

So, are talking about the same software?

I guess not
Too funny - we have a gmat club app (not sure if it is available for sale in japan)
gmat-club-apple-app-for-ipod-iphone-81492.html

I assumed this was a reference to the GMAT Club app, though you never really stated that it was. My bad
_________________

Founder of GMAT Club

Just starting out with GMAT? Start here... or use our Daily Study Plan

Co-author of the GMAT Club tests

Kudos [?]: 30003 [0], given: 5457

Intern
Joined: 05 Oct 2009
Posts: 32

Kudos [?]: 15 [0], given: 14

Location: Hamamatsu, Japan
Schools: Attending IE Nov 2010
WE 1: 11 years int'l work experience

### Show Tags

08 Oct 2009, 00:06
Jones105 wrote:
I recently took a practice test with my iPhone software (GMAT Math ver 1.1) and got a question I don't altogether agree with. Can someone help me out here?

...

thanks for any insights...

Hmm, your above posts got me intrigued and I've done some more research. I did find the GMAT Club software on the app store (and just purchased it) but my post was never intended to reference that app. Perhaps "GMAT Math" software on the iphone is too generic a term.

Sorry for any trouble!

Kudos [?]: 15 [0], given: 14

Founder
Joined: 04 Dec 2002
Posts: 16318

Kudos [?]: 30003 [0], given: 5457

Location: United States (WA)
GMAT 1: 750 Q49 V42

### Show Tags

08 Oct 2009, 00:16
Jones105 wrote:
Jones105 wrote:
I recently took a practice test with my iPhone software (GMAT Math ver 1.1) and got a question I don't altogether agree with. Can someone help me out here?

...

thanks for any insights...

Hmm, your above posts got me intrigued and I've done some more research. I did find the GMAT Club software on the app store (and just purchased it) but my post was never intended to reference that app. Perhaps "GMAT Math" software on the iphone is too generic a term.

Sorry for any trouble!

No worries at all - any feedback about the app is welcome!
_________________

Founder of GMAT Club

Just starting out with GMAT? Start here... or use our Daily Study Plan

Co-author of the GMAT Club tests

Kudos [?]: 30003 [0], given: 5457

Intern
Joined: 04 Jun 2011
Posts: 15

Kudos [?]: 8 [0], given: 5

Concentration: Finance
GMAT 1: 710 Q50 V36
GPA: 3.37
WE: Analyst (Mutual Funds and Brokerage)

### Show Tags

02 Feb 2012, 21:59
I know this is an old post but is anyone still having issues with this app?

Kudos [?]: 8 [0], given: 5

Re: Is the point (x,y) in the fourth quadrant?   [#permalink] 02 Feb 2012, 21:59

Go to page    1   2    Next  [ 23 posts ]

Display posts from previous: Sort by