It is currently 23 Nov 2017, 02:39

### 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

# M21-16

Author Message
Director
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 506

Kudos [?]: 72 [0], given: 562

Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)

### Show Tags

10 Feb 2013, 04:27
1 gives us
y=0 or y=1

2 gives us the same.

Had 2 resulted in y=0 or y=2, would the answer have been C? cause y=0 is common in both statements ?
Attachments

Capture.JPG [ 12.54 KiB | Viewed 1028 times ]

_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : http://gmatclub.com/forum/end-of-my-gmat-journey-149328.html#p1197992

Kudos [?]: 72 [0], given: 562

Math Expert
Joined: 02 Sep 2009
Posts: 42322

Kudos [?]: 133091 [0], given: 12408

### Show Tags

10 Feb 2013, 04:35
Sachin9 wrote:
1 gives us
y=0 or y=1

2 gives us the same.

Had 2 resulted in y=0 or y=2, would the answer have been C? cause y=0 is common in both statements ?

What is the value of $$y$$?

(1) $$y^3+2y=y+2y^2$$. Rearrange and factor out $$y$$ to get $$y(y^2-2y+1)=0$$, which is the same as $$y(y-1)^2=0$$, so $$y=0$$ or $$y=1$$. Not sufficient.

(2) $$y^2=y$$. The same two solutions: $$y=0$$ or $$y=1$$. Not sufficient.

(1)+(2) Nothing new. Not sufficient.

As for your question: if from (2) we had that y=0 or y=2, then the answer would be C: y=0.
_________________

Kudos [?]: 133091 [0], given: 12408

Director
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 506

Kudos [?]: 72 [0], given: 562

Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)

### Show Tags

10 Feb 2013, 04:58
Bunuel wrote:
Sachin9 wrote:
1 gives us
y=0 or y=1

2 gives us the same.

Had 2 resulted in y=0 or y=2, would the answer have been C? cause y=0 is common in both statements ?

What is the value of $$y$$?

(1) $$y^3+2y=y+2y^2$$. Rearrange and factor out $$y$$ to get $$y(y^2-2y+1)=0$$, which is the same as $$y(y-1)^2=0$$, so $$y=0$$ or $$y=1$$. Not sufficient.

(2) $$y^2=y$$. The same two solutions: $$y=0$$ or $$y=1$$. Not sufficient.

(1)+(2) Nothing new. Not sufficient.

As for your question: if from (2) we had that y=0 or y=2, then the answer would be C: y=0.

Sorry Sir, Will adhere to rule 6 going forward.

Had 2 resulted in y=3 or y=4, answer would have been E ?
_________________

hope is a good thing, maybe the best of things. And no good thing ever dies.

Who says you need a 700 ?Check this out : http://gmatclub.com/forum/who-says-you-need-a-149706.html#p1201595

My GMAT Journey : http://gmatclub.com/forum/end-of-my-gmat-journey-149328.html#p1197992

Kudos [?]: 72 [0], given: 562

Math Expert
Joined: 02 Sep 2009
Posts: 42322

Kudos [?]: 133091 [1], given: 12408

### Show Tags

10 Feb 2013, 05:04
1
KUDOS
Expert's post
Sachin9 wrote:
Bunuel wrote:
Sachin9 wrote:
1 gives us
y=0 or y=1

2 gives us the same.

Had 2 resulted in y=0 or y=2, would the answer have been C? cause y=0 is common in both statements ?

What is the value of $$y$$?

(1) $$y^3+2y=y+2y^2$$. Rearrange and factor out $$y$$ to get $$y(y^2-2y+1)=0$$, which is the same as $$y(y-1)^2=0$$, so $$y=0$$ or $$y=1$$. Not sufficient.

(2) $$y^2=y$$. The same two solutions: $$y=0$$ or $$y=1$$. Not sufficient.

(1)+(2) Nothing new. Not sufficient.

As for your question: if from (2) we had that y=0 or y=2, then the answer would be C: y=0.

Sorry Sir, Will adhere to rule 6 going forward.

Had 2 resulted in y=3 or y=4, answer would have been E ?

No. In this case the question would be flawed: on the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other.

Thus the case when from (1) we have that y=0 or y=1 and from (2) we have that y=3 or y=4, is not possible, since in this case the statements clearly contradict each other.

Hope it's clear.
_________________

Kudos [?]: 133091 [1], given: 12408

Re: M21-16   [#permalink] 10 Feb 2013, 05:04
Display posts from previous: Sort by

# M21-16

Moderator: Bunuel

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.