NEW HERE? LEARN MORE
closeclose
Last visit was: 06 May 2024, 03:51 It is currently 06 May 2024, 03:51
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

For all positive integers n, /n/ is defined as the number

User avatar
B
kevincan
GMAT Instructor
Joined: 04 Jul 2006
Posts: 960
Own Kudos [?]: 694 [0]
Given Kudos: 6
Location: Madrid
 Q51  V50
Send PM
For all positive integers n, /n/ is defined as the number [#permalink] New post   16 Nov 2006, 08:33
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Hide Show timer Statistics
For all positive integers n, /n/ is defined as the number that results when the digits of n are written in reverse order. For example, /27/=72 and /720/=27. What is the sum of the digits of x?

(1) x+/x/=1211
(2) //x//=x



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
FN
Current Student
Joined: 28 Dec 2004
Posts: 1581
Own Kudos [?]: 642 [0]
Given Kudos: 2
Location: New York City
Concentration: Social Enterprise
Schools:Wharton'11 HBS'12
Send PM
Re: For all positive integers n, /n/ is defined as the number [#permalink] New post   16 Nov 2006, 10:04
since numbers are all positive...
then all i need to do is try single digit numbers that sums add to 11

3 + 8=11 try that number doesnt add to 1211 but rather 1221..

so picked 4 & 7

4 X 7
7 x 4
now if x=5..then we get 1211...

so does n= 952; sum equal 16

statement 2) jus repeats the stem

A it is.

took about 2mins..
User avatar
ugo_castelo
Manager
Manager
Joined: 04 May 2006
Posts: 104
Own Kudos [?]: 146 [0]
Given Kudos: 0
Location: paris
Send PM
Re: For all positive integers n, /n/ is defined as the number [#permalink] New post   16 Nov 2006, 12:11
Getting E


st1 is not suf
655 , 556 or 259 or 952
st2 is not suf, the reverse function of both are true

ex if n=655, f(n)=556, ff(n)=665
User avatar
FN
Current Student
Joined: 28 Dec 2004
Posts: 1581
Own Kudos [?]: 642 [0]
Given Kudos: 2
Location: New York City
Concentration: Social Enterprise
Schools:Wharton'11 HBS'12
Send PM
Re: For all positive integers n, /n/ is defined as the number [#permalink] New post   16 Nov 2006, 13:45
655, 556 or 952 all add up to a sum of 16...

ugo_castelo wrote:
Getting E


st1 is not suf
655 , 556 or 259 or 952
st2 is not suf, the reverse function of both are true

ex if n=655, f(n)=556, ff(n)=665
avatar
AK47
Manager
Manager
Joined: 05 Oct 2006
Posts: 157
Own Kudos [?]: 45 [0]
Given Kudos: 0
Send PM
Re: For all positive integers n, /n/ is defined as the number [#permalink] New post   17 Nov 2006, 07:28
choice 1.

sum of a digitt an it's reverse should be divisible by 11.
1211 is not div by 11.so it means that there is a zero at the end of the no...
and icant think of a no that has a zero and satisfies the baove number(1211)

closest i could think was 1120..
1120+211=1331..

insufficient.

choice 2.

//x// = x holds only if there is no zero at the end of that no...
since there can be diferent combinations of oter no..
so this choice is also insufficient..

together also not sufficient.

Choice E as per me.

can somebody show a more definite way of tackling such problems???





kevincan wrote:
For all positive integers n, /n/ is defined as the number that results when the digits of n are written in reverse order. For example, /27/=72 and /720/=27. What is the sum of the digits of x?

(1) x+/x/=1211
(2) //x//=x
User avatar
ncp
Current Student
Joined: 08 Nov 2006
Posts: 1415
Own Kudos [?]: 308 [0]
Given Kudos: 1
Location: Ann Arbor
Concentration: Health Care Marketing
Schools:Ross '10
Send PM
Re: For all positive integers n, /n/ is defined as the number [#permalink] New post   17 Nov 2006, 08:56
kevincan,

The question does not ask you to find the number. It just asks you to find the sum of the digits.

So, the answer is A because both the numbers you got have the same sum of digits.
User avatar
ugo_castelo
Manager
Manager
Joined: 04 May 2006
Posts: 104
Own Kudos [?]: 146 [0]
Given Kudos: 0
Location: paris
Send PM
Re: For all positive integers n, /n/ is defined as the number [#permalink] New post   17 Nov 2006, 13:05
Yes , the answer should be A. I read too fast , it asked the sum, not X
User avatar
Special
Intern
Intern
Joined: 14 Nov 2006
Posts: 3
Own Kudos [?]: 1 [0]
Given Kudos: 0
Send PM
Re: For all positive integers n, /n/ is defined as the number [#permalink] New post   17 Nov 2006, 15:40
I still cannot figure it out, more explanation please.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: For all positive integers n, /n/ is defined as the number [#permalink]
17 Nov 2006, 15:40
Moderators:
Bunuel
Math Expert
93051 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts
GMATBusters
GMAT Tutor
1904 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions