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

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

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06 Oct 2009, 19:26
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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...
[Reveal] Spoiler: OA

Last edited by Bunuel on 02 Feb 2012, 23:36, edited 2 times in total.
Added the OA
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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06 Oct 2009, 19:41
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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...

This is yes/no DS problem:

(1) xy>0 --> x an y have 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

D.

In the 4th quadrant y is negative x is positive and xy<o

Does your software say the answer is A? If so it's not right. Answer is D each alone is sufficient.
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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06 Oct 2009, 19:49
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!
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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06 Oct 2009, 20:37
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!
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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06 Oct 2009, 20:45
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?
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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06 Oct 2009, 20:49
Thanks! Let me look into this.
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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06 Oct 2009, 21:12
Jones105 wrote:
Muchas Gracias!

De nada!
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.
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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07 Oct 2009, 01:48
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.
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Intern
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Location: Hamamatsu, Japan
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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07 Oct 2009, 06:25
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...
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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07 Oct 2009, 06:45
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...

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Intern
Joined: 05 Oct 2009
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Location: Hamamatsu, Japan
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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07 Oct 2009, 07:13
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.
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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07 Oct 2009, 07:24
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.

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Re: an error in my iphone software? Or just an oversight... [#permalink]

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07 Oct 2009, 09:10
+1 from me also
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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07 Oct 2009, 20:15
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?
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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07 Oct 2009, 23:51
I also looked through the Veritas app - can't find it there either...
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Intern
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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08 Oct 2009, 01:01
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? Founder Affiliations: AS - Gold, HH-Diamond Joined: 04 Dec 2002 Posts: 14102 Location: United States (WA) GMAT 1: 750 Q49 V42 GPA: 3.5 Followers: 3599 Kudos [?]: 21720 [0], given: 4394 Re: an error in my iphone software? Or just an oversight... [#permalink] Show Tags 08 Oct 2009, 01:02 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
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Intern
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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08 Oct 2009, 01:06
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!
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Re: an error in my iphone software? Or just an oversight... [#permalink]

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08 Oct 2009, 01:16
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!
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Re: I recently took a practice test with my iPhone software [#permalink]

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02 Feb 2012, 22:59
I know this is an old post but is anyone still having issues with this app?
Re: I recently took a practice test with my iPhone software   [#permalink] 02 Feb 2012, 22:59

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