BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

If n is an integer....? Help Please!!

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members
Location: Milpitas, CA
Thanked: 1854 times
GMAT Score:770

by Anurag@Gurome » Fri Dec 23, 2011 8:04 pm
gmatpup wrote:If n is an integer, is -3x^n positive?

A. x is odd

B. n is odd


Answer is C

Please explain why A is not the answer?

Thanks again!!

(1) If x = 1 (odd), n = 1 (odd) then -3x^n = -3(1)^1 = negative.
If x = -1 (odd), n = 1 (odd) then -3x^n = -3(-1)^(1) = positive.
No definite answer; NOT sufficient.

(2) Again taking the same examples as in statement 1, we know (2) is also NOT sufficient.

Combining (1) and (2) also, taking the same examples as in 1, we do not know if -3x^n is positive or not; NOT sufficient.

According to me the answer should be E, can you please check it?
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Community Manager
Posts: 1060
Joined: Fri May 13, 2011 6:46 amFollowed by: 52 members
Location: Utrecht, The Netherlands
Thanked: 318 times

by neelgandham » Sat Dec 24, 2011 4:46 am
If n is an integer, is -3x^n positive?
A. x is odd
If x = -3 and if n = 3, -3x^n is Positive
If x = -3 and if n = 4, -3x^n is Negative
If x = 3 and if n = 3, -3x^n is Negative
If x = 3 and if n = 4, -3x^n is Negative
B. n is odd

If x = -3 and if n = 3, -3x^n is Positive
If x = 3 and if n = 3, -3x^n is Negative
If x = 0 and if n = 3, -3x^n is Neither positive, nor negative

From A and B, x is odd and n is odd.
If x = -3 and if n = 3, -3x^n is Positive
If x = 3 and if n = 3, -3x^n is Negative

IMO E. As Anurag requested, Can you please check ?
Anil Gandham
Welcome to BEATtheGMAT | Photography | Getting Started | BTG Community rules | MBA Watch
Check out GMAT Prep Now's online course at https://www.gmatprepnow.com/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 425
Joined: Wed Dec 08, 2010 9:00 amFollowed by: 7 members
Thanked: 56 times
GMAT Score:690

by LalaB » Sat Dec 24, 2011 8:13 am
gmatpup wrote:If n is an integer, is -3x^n positive?

A. x is odd

B. n is odd


Answer is C

Please explain why A is not the answer?

Thanks again!!
hm, may be in A option it is said x is negative?
it would be better :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1084
Joined: Fri Apr 15, 2011 2:33 pmFollowed by: 21 members
Thanked: 158 times

by pemdas » Sat Dec 24, 2011 8:37 am
yes, please check the source

restate -x^n positive?
n is integer
st(1) x is odd, implies x cannot be 0 and following
- positive x returns negative number when n is odd/even;
- negative x returns positive number when n is odd and returns negative number when n is even;
Not Sufficient
st(2) n is odd, implies only power and without x this is Not Sufficient
Combined st(1&2): if x>0 and odd (st.1)along with n is odd (st.2) -3x^n is negative.
If x<0 and odd (st.1)along with n is odd (st.2) -3x^n is positive.
Not Sufficient
gmatpup wrote:If n is an integer, is -3x^n positive?

A. x is odd

B. n is odd


Answer is C

Please explain why A is not the answer?

Thanks again!!
Success doesn't come overnight!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 10
Joined: Mon Dec 05, 2011 3:33 pm

by CollegeKart » Sat Dec 24, 2011 11:20 am
i agree with Anurag. With the given information the answer should be E
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 13
Joined: Thu Dec 08, 2011 10:39 pm

SO E

by arpan20690 » Tue Dec 27, 2011 12:53 am
-3x^n: its sign depends on the sign of x and nature of n ( whether odd or even).
Sign of x is not mentioned anywhere. So, both conditions are NOT SUFFICIENT individually
and together also. SO E is the right answer.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 82
Joined: Fri Nov 04, 2011 12:35 amFollowed by: 2 members

by amit28it » Fri Dec 30, 2011 4:22 am
Hello buddy,
Sorry to be here but can anyone suggest me to solve my typical questions related to Decimals for Grade IV . So please help me .
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1