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Is x = 0 ?

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

Kudos [?]: 27 [0], given: 0

Is x = 0 ? [#permalink] New post 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
SVP
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Joined: 07 Nov 2007
Posts: 1829
Location: New York
Followers: 27

Kudos [?]: 472 [0], given: 5

Re: Is x = 0 ? [#permalink] New post 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


Answer should be B

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
_________________

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

Kudos [?]: 27 [0], given: 0

Re: Is x = 0 ? [#permalink] New post 27 Jan 2009, 19:59
aaaah. okay, makes sense. Thanks!
Manager
Manager
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Joined: 04 Jan 2009
Posts: 243
Followers: 1

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

Re: Is x = 0 ? [#permalink] New post 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


Answer should be B

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
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