GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Aug 2018, 14:00

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Source : KAPLAN CAT Is x odd ? (1) 2x-1 is odd. (2) x is odd

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
VP
VP
User avatar
Joined: 30 Jun 2008
Posts: 1004
Source : KAPLAN CAT Is x odd ? (1) 2x-1 is odd. (2) x is odd  [#permalink]

Show Tags

New post 25 Oct 2008, 07:18
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

HideShow timer Statistics

Source : KAPLAN CAT

Is x odd ?

(1) 2x-1 is odd.
(2) x³ is odd.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Kaplan GMAT Prep Discount CodesEconomist GMAT Tutor Discount CodesJamboree Discount Codes
VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1328
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 25 Oct 2008, 09:52
B

2x-1 is odd means 2x is even means x can be odd or even.

x^3 is odd is there is no even number in the multiplication 3 times. X has to be odd, because its the same number.
VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1328
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 25 Oct 2008, 10:03
amitdgr wrote:
i fell for the same trap


Hmm, What is the common trap that all of us fell for?
VP
VP
User avatar
Joined: 30 Jun 2008
Posts: 1004
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 25 Oct 2008, 10:18
Kaplan CAT says "Also don't make the mistake of assuming that x must be an integer. The question stem does not say that x is an integer"

What if x = CUBEROOT(7) ???

then x³ = 7 (odd)

statement 1 says x is an integer
statement 2 tells its odd :)

so C.

I picked B while on test.
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1328
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 25 Oct 2008, 10:24
amitdgr wrote:
Kaplan CAT says "Also don't make the mistake of assuming that x must be an integer. The question stem does not say that x is an integer"

What if x = CUBEROOT(7) ???

then x³ = 7 (odd)

statement 1 says x is an integer
statement 2 tells its odd :)

so C.

I picked B while on test.


Thanks we should be noticing better. Should not suffer from carry over from statement 1
VP
VP
User avatar
Joined: 30 Jun 2008
Posts: 1004
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 25 Oct 2008, 10:46
icandy wrote:
amitdgr wrote:
Kaplan CAT says "Also don't make the mistake of assuming that x must be an integer. The question stem does not say that x is an integer"

What if x = CUBEROOT(7) ???

then x³ = 7 (odd)

statement 1 says x is an integer
statement 2 tells its odd :)

so C.

I picked B while on test.


Thanks we should be noticing better. Should not suffer from carry over from statement 1


I know :(
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Senior Manager
Senior Manager
User avatar
Joined: 21 Apr 2008
Posts: 265
Location: Motortown
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 25 Oct 2008, 13:06
amitdgr wrote:
Source : KAPLAN CAT

Is x odd ?

(1) 2x-1 is odd.
(2) x³ is odd.


I fell for the same trap :roll:

1. 2x - 1 = Odd
2x = even
x could be even(2) or odd(1), but an ineteger
Not Sufficient

2. X need not be an integer

Together
X is Odd - Sufficient
Retired Moderator
User avatar
B
Joined: 05 Jul 2006
Posts: 1731
GMAT ToolKit User Premium Member
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 25 Oct 2008, 13:32
I fell for the same trap too :lol:
VP
VP
User avatar
Joined: 30 Jun 2008
Posts: 1004
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 25 Oct 2008, 21:17
hahaha :) so many of us tripped into the same trap
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

VP
VP
avatar
Joined: 17 Jun 2008
Posts: 1474
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 26 Oct 2008, 23:09
Same here :o
SVP
SVP
User avatar
Joined: 29 Aug 2007
Posts: 2419
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 27 Oct 2008, 10:50
amitdgr wrote:
Source : KAPLAN CAT

Is x odd ?

(1) 2x-1 is odd.
(2) x³ is odd.


The question for me ok but OE or OA are something misleading or ambigious. Since the question is asking whther x is an odd or even. This is yes/no question. So it excludes all posssibilities other than ODD and EVEN.

Statement 1 is a standard GMAT level information cus it has no ambiguity but Statement 2 is definitely an ambigious one. We can argu that x can be a fraction, but the issue is not a possibility of x being a fraction. The issue in hand here is whether x is odd or even. So the question should exclude all possibility of x being other than odd or even.

I know we can keep on arguing on statement 2 but I for me it (statement 2) is sufficient.
_________________

Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html
Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html
Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html


GT

VP
VP
avatar
Joined: 17 Jun 2008
Posts: 1474
Re: DS : Is x odd ?  [#permalink]

Show Tags

New post 29 Oct 2008, 00:20
GMAT TIGER wrote:
amitdgr wrote:
Source : KAPLAN CAT

Is x odd ?

(1) 2x-1 is odd.
(2) x³ is odd.


The question for me ok but OE or OA are something misleading or ambigious. Since the question is asking whther x is an odd or even. This is yes/no question. So it excludes all posssibilities other than ODD and EVEN.

Statement 1 is a standard GMAT level information cus it has no ambiguity but Statement 2 is definitely an ambigious one. We can argu that x can be a fraction, but the issue is not a possibility of x being a fraction. The issue in hand here is whether x is odd or even. So the question should exclude all possibility of x being other than odd or even.

I know we can keep on arguing on statement 2 but I for me it (statement 2) is sufficient.



GT, I do not think, stmt2 has ambiguity. Take the example of x = 1,3,5,7,9,..... and x^3 is odd. Also, take x = cube root of 1,3,5,7,9,.... and x^3 is odd. Thus, in one case, x is odd and in the other case it is not odd. That is the reason why stmt2 is not sufficient.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: DS : Is x odd ? &nbs [#permalink] 29 Oct 2008, 00:20
Display posts from previous: Sort by

Source : KAPLAN CAT Is x odd ? (1) 2x-1 is odd. (2) x is odd

  post reply Question banks Downloads My Bookmarks Reviews Important topics  

Events & Promotions

PREV
NEXT


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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®.