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M21-16

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Director
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M21-16 [#permalink] New post 10 Feb 2013, 04:27
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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 ?
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Re: M21-16 [#permalink] New post 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 ?


Please, DO NOT post pictures of questions. Rule #6 here: rules-for-posting-please-read-this-before-posting-133935.html

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.

Answer: E.

As for your question: if from (2) we had that y=0 or y=2, then the answer would be C: y=0.
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Director
Director
Status: Gonna rock this time!!!
Joined: 22 Jul 2012
Posts: 551
Location: India
GMAT 1: 640 Q43 V34
GMAT 2: 630 Q47 V29
WE: Information Technology (Computer Software)
Followers: 1

Kudos [?]: 13 [0], given: 560

GMAT Tests User
Re: M21-16 [#permalink] New post 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 ?


Please, DO NOT post pictures of questions. Rule #6 here: rules-for-posting-please-read-this-before-posting-133935.html

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.

Answer: E.

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.

Thanks for the reply..
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 : end-of-my-gmat-journey-149328.html#p1198742

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Re: M21-16 [#permalink] New post 10 Feb 2013, 05:04
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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 ?


Please, DO NOT post pictures of questions. Rule #6 here: rules-for-posting-please-read-this-before-posting-133935.html

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.

Answer: E.

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.

Thanks for the reply..
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.
_________________

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!


What are GMAT Club Tests?
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Find out what's new at GMAT Club - latest features and updates

Re: M21-16   [#permalink] 10 Feb 2013, 05:04
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