What is the value of the integer n? : GMAT Data Sufficiency (DS)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 20 Jan 2017, 19:05

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

What is the value of the integer n?

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

Hide Tags

Manager
Joined: 06 Feb 2010
Posts: 176
Schools: University of Dhaka - Class of 2010
GMAT 1: Q0 V0
GPA: 3.63
WE: Business Development (Consumer Products)
Followers: 61

Kudos [?]: 1179 [0], given: 182

What is the value of the integer n? [#permalink]

Show Tags

24 Oct 2010, 23:25
1
This post was
BOOKMARKED
00:00

Difficulty:

35% (medium)

Question Stats:

68% (01:51) correct 32% (01:04) wrong based on 156 sessions

HideShow timer Statistics

What is the value of the integer n?

(1) n(n+2)=15
(2) (n+2)^n =125

[Reveal] Spoiler:
But I don’t know how to finish it…
(n+2)^n=5^3
How it is n=3, here base n=2 and 5 is not same..

OPEN DISCUSSION OF THIS QUESTION IS HERE: what-is-the-value-of-the-integer-n-1-n-n-2-15-2-n-107149.html
[Reveal] Spoiler: OA

_________________

Practice Makes a Man Perfect. Practice. Practice. Practice......Perfectly

Critical Reasoning: http://gmatclub.com/forum/best-critical-reasoning-shortcuts-notes-tips-91280.html

Collections of MGMAT CAT: http://gmatclub.com/forum/collections-of-mgmat-cat-math-152750.html

MGMAT SC SUMMARY: http://gmatclub.com/forum/mgmat-sc-summary-of-fourth-edition-152753.html

Sentence Correction: http://gmatclub.com/forum/sentence-correction-strategies-and-notes-91218.html

Arithmatic & Algebra: http://gmatclub.com/forum/arithmatic-algebra-93678.html

Helpful Geometry formula sheet: http://gmatclub.com/forum/best-geometry-93676.html

I hope these will help to understand the basic concepts & strategies. Please Click ON KUDOS Button.

Intern
Joined: 11 Oct 2010
Posts: 2
Followers: 0

Kudos [?]: 1 [1] , given: 0

Re: Value of an integer [#permalink]

Show Tags

24 Oct 2010, 23:34
1
KUDOS
the first statement n(n+2)=15 would give two integer values as -3 and 5; not conclusive

The second statement (n+2)^n =125 can be written as

(n+2)^n = 5^3
=(3+2)^3 =5^3 --replacing n with 3
LHS =RHS

n =3, conclusive
Current Student
Joined: 25 Sep 2012
Posts: 300
Location: India
Concentration: Strategy, Marketing
GMAT 1: 660 Q49 V31
GMAT 2: 680 Q48 V34
Followers: 2

Kudos [?]: 133 [1] , given: 242

Re: What is the value of the integer n? (1) n(n+2)=15 (2) [#permalink]

Show Tags

29 May 2014, 07:32
1
KUDOS
(A) Insufficient
n= -5 -5*(-5+2) = -5*(-3) = 15 OR
n= 3 3*(3+2) = 3*5 = 15

(B) Sufficient
n= 3
$$(3+2)^2$$ = $$5^3$$

Mods please hide the answer in the first post
Math Expert
Joined: 02 Sep 2009
Posts: 36583
Followers: 7087

Kudos [?]: 93284 [0], given: 10555

Re: What is the value of the integer n? (1) n(n+2)=15 (2) [#permalink]

Show Tags

29 May 2014, 07:53
b2bt wrote:
(A) Insufficient
n= -5 -5*(-5+2) = -5*(-3) = 15 OR
n= 3 3*(3+2) = 3*5 = 15

(B) Sufficient
n= 3
$$(3+2)^2$$ = $$5^3$$

Mods please hide the answer in the first post

______________
Done. Thank you.
_________________
Intern
Joined: 13 May 2013
Posts: 30
Followers: 0

Kudos [?]: 9 [0], given: 28

Re: What is the value of the integer n? [#permalink]

Show Tags

04 Jun 2014, 03:03
Could you perhaps tell us how you came up with the numbers that you plugged in?
I lost valuable time by first trying to re-write the equations (without success).
Math Expert
Joined: 02 Sep 2009
Posts: 36583
Followers: 7087

Kudos [?]: 93284 [1] , given: 10555

Re: What is the value of the integer n? [#permalink]

Show Tags

04 Jun 2014, 03:10
1
KUDOS
Expert's post
Saabs wrote:
Could you perhaps tell us how you came up with the numbers that you plugged in?
I lost valuable time by first trying to re-write the equations (without success).

What is the value of the integer n?

(1) n(n + 2) = 15 --> $$n^2+2n-15=0$$ --> $$(n+5)(n-3)=0$$ --> $$n=-5$$ or $$n=3$$. Not sufficient.

(2) (n + 2)^n = 125 --> as $$n$$ is an integer then $$(n + 2)^n=125^1=5^3$$ (125 can be written as integer^integer only in those two ways), only $$n=3$$ works: $$(2+3)^3=5^3=125$$. Sufficient.

OPEN DISCUSSION OF THIS QUESTION IS HERE: what-is-the-value-of-the-integer-n-1-n-n-2-15-2-n-107149.html
_________________
Re: What is the value of the integer n?   [#permalink] 04 Jun 2014, 03:10
Similar topics Replies Last post
Similar
Topics:
1 What is the value of the integer n? 8 12 Oct 2016, 00:56
1 What is the value of the integer N? 1 23 May 2016, 01:28
9 What is the value of integer n? 16 09 Feb 2014, 02:47
4 What is the value of integer n? 2 03 Dec 2012, 02:22
6 What is the value of the integer n? 2 27 Jan 2012, 15:39
Display posts from previous: Sort by

What is the value of the integer n?

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.