Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 07 Jul 2015, 08:43

### 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 x = 0 ?

Author Message
TAGS:
Manager
Joined: 02 Aug 2007
Posts: 232
Schools: Life
Followers: 3

Kudos [?]: 37 [0], given: 0

Is x = 0 ? [#permalink]  27 Jan 2009, 19:24
Is $$x = 0$$ ?

1. $$xy = x$$
2. $$x + y = y$$

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient

My reasoning is the following but OA is different, what am I doing wrong?
Stat1: xy - x = 0 ===> x = 0, y = 1...sufficient
Stat1: x = 0
SVP
Joined: 07 Nov 2007
Posts: 1824
Location: New York
Followers: 29

Kudos [?]: 565 [0], given: 5

Re: Is x = 0 ? [#permalink]  27 Jan 2009, 19:38
x-ALI-x wrote:
Is $$x = 0$$ ?

1. $$xy = x$$
2. $$x + y = y$$

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient

My reasoning is the following but OA is different, what am I doing wrong?
Stat1: xy - x = 0 ===> x = 0, y = 1...sufficient
Stat1: x = 0

state1: x(y-1)=0 MEANS either x=0 or y=1
its not necessary that both conditions have to satisified
e.g. x=2 y=1 --> x(y-1) = 0
e.g x=0 y=3 -->x(y-1) = 0
x can be 0 or any other number..
multiple solutions
statement 1 is not suffcieint

stat2: straight forward x=0
_________________

Smiling wins more friends than frowning

Manager
Joined: 02 Aug 2007
Posts: 232
Schools: Life
Followers: 3

Kudos [?]: 37 [0], given: 0

Re: Is x = 0 ? [#permalink]  27 Jan 2009, 19:59
aaaah. okay, makes sense. Thanks!
Manager
Joined: 04 Jan 2009
Posts: 241
Followers: 1

Kudos [?]: 9 [0], given: 0

Re: Is x = 0 ? [#permalink]  28 Jan 2009, 09:35
remains true even if y=0 for if y=0
x+0=0.
x2suresh wrote:
x-ALI-x wrote:
Is $$x = 0$$ ?

1. $$xy = x$$
2. $$x + y = y$$

* Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient
* Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient
* BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient
* EACH statement ALONE is sufficient
* Statements (1) and (2) TOGETHER are NOT sufficient

My reasoning is the following but OA is different, what am I doing wrong?
Stat1: xy - x = 0 ===> x = 0, y = 1...sufficient
Stat1: x = 0

state1: x(y-1)=0 MEANS either x=0 or y=1
its not necessary that both conditions have to satisified
e.g. x=2 y=1 --> x(y-1) = 0
e.g x=0 y=3 -->x(y-1) = 0
x can be 0 or any other number..
multiple solutions
statement 1 is not suffcieint

stat2: straight forward x=0

_________________

-----------------------
tusharvk

Re: Is x = 0 ?   [#permalink] 28 Jan 2009, 09:35
Similar topics Replies Last post
Similar
Topics:
4 x^2 - x < 0 4 13 May 2012, 11:54
x^4-3x^3+2=0 3 07 Jan 2009, 14:23
If x not equal to 0, then /(x) = -1 0 1 a /x 4 18 May 2008, 17:19
Is sqrt (x 5)^2 = 5 x ? (1) -x|x| < 0 (2) 5 x > 0 2 10 Mar 2008, 22:19
Is x+y >0? 1) x/(x+y)>0 2) y/(x+y)>0 3 12 Feb 2006, 01:42
Display posts from previous: Sort by