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

It is currently 24 Jul 2014, 07:30

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

For all integers n n = n*(n-1). What is the value of x ? 1 x

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 18 Aug 2005
Posts: 86
Location: Italy, Rome caput mundi
Followers: 1

Kudos [?]: 2 [0], given: 0

For all integers n n = n*(n-1). What is the value of x ? 1 x [#permalink] New post 12 Sep 2005, 08:58
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
For all integers n n°= n*(n-1). What is the value of x°?

1 x°=x
2 (x-1)°=x-2

please...indicate how long it took you to work it out..grazie=)
_________________

"To win the battle you need to last 15 minutes longer than your enemies"

Current Student
avatar
Joined: 28 Dec 2004
Posts: 3405
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 150 [0], given: 2

GMAT Tests User
 [#permalink] New post 12 Sep 2005, 09:05
D it is...

x=2

about 30 secs....
VP
VP
avatar
Joined: 22 Aug 2005
Posts: 1128
Location: CA
Followers: 1

Kudos [?]: 23 [0], given: 0

GMAT Tests User
 [#permalink] New post 12 Sep 2005, 09:20
B.
I messed up in algebra.

Given: n0 = n * (n - 1) ------ (a)

i)
x0 = x
from (a), substitute value od x0:
x* (x - 1) = x

As x can be 0 (its integer), we cannot divide this equation. Simplifying:
x ^ 2 - x = x
x ^ 2 - 2 x = 0
we cannot solve this for x, and therefore cannot compute x0.

ii) (x - 1)0 = x - 2
from (a)
(x - 1) ( x - 2) = (x - 2)

x^2 - 4x + 4 = 0

or x = 2.

Last edited by duttsit on 12 Sep 2005, 09:55, edited 1 time in total.
Manager
Manager
avatar
Joined: 15 Jul 2005
Posts: 106
Followers: 1

Kudos [?]: 4 [0], given: 0

 [#permalink] New post 12 Sep 2005, 09:32
haha... 3rd different answer!

i go with (b)

statement I: x(x-1)=x
x^2-2x=0
x(x-2)=0

x = 0 or x=2... insufficient.

statement II: (x-1)(x-2)=x-2
instead of opening it out, we can tell that x-1=1 or x = 2, thus, sufficient.
Senior Manager
Senior Manager
avatar
Joined: 30 Oct 2004
Posts: 289
Followers: 1

Kudos [?]: 4 [0], given: 0

GMAT Tests User
 [#permalink] New post 12 Sep 2005, 10:45
B) chets method.
Less than a minute.
_________________

-Vikram

Manager
Manager
avatar
Joined: 18 Aug 2005
Posts: 86
Location: Italy, Rome caput mundi
Followers: 1

Kudos [?]: 2 [0], given: 0

 [#permalink] New post 13 Sep 2005, 07:26
OA i s b..thanks everyone
_________________

"To win the battle you need to last 15 minutes longer than your enemies"

  [#permalink] 13 Sep 2005, 07:26
    Similar topics Author Replies Last post
Similar
Topics:
1 If A(n)=1/(n(n+1)) for all positive integers n, what is the Dixon 3 01 Sep 2013, 11:46
2 Experts publish their posts in the topic For all integers n, n* = n(n – 1). what is the value of x* itsagulati 3 14 Jul 2013, 19:34
3 Experts publish their posts in the topic For all integers n, n* = n(n – 1). What is the value of x* w srini123 13 20 Nov 2009, 15:24
For all integers n, n* = n(n-1). What is the value of x*? 1) shoonya 6 23 Jul 2006, 19:06
For all integers n, n*=n(n-1). What is the value of x? 1) x* gayathri 2 14 Jan 2005, 17:17
Display posts from previous: Sort by

For all integers n n = n*(n-1). What is the value of x ? 1 x

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.