Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
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.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 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
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
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
GMATOnDemandStart 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 563 reviewsTarget Test Prep

Must be true --> a3b = ab3

Expert replies
Post new topic Post Reply
Subscribe topic
Previous Topic Next Topic
User avatar
Legendary Member
Posts: 682
Joined: Fri Jan 16, 2009 2:40 amFollowed by: 1 member
Thanked: 32 times
by Vemuri » Wed Apr 15, 2009 9:39 am
If ab ≠ 0 and a^3b = ab^3, then which of the following must be true?

a = b
a = –b
ab = 1

A. None
B. I only
C. III only
D. I and III only
E. I, II, and III

OA is A. Please explain with reasoning
Last edited by Vemuri on Thu Apr 16, 2009 4:21 am, edited 1 time in total.
Top
Join the discussion
Source: — Data Sufficiency |
Legendary Member
Posts: 1035
Joined: Wed Aug 27, 2008 10:56 pmFollowed by: 1 member
Thanked: 104 times

by scoobydooby » Wed Apr 15, 2009 9:56 am
if a3b=ab3, then b must be 3.
the number must be of the form a33. a can take any value.

not necessary that a must be =b, -b or ab=1.
hence, A
Top
Join the discussion
Legendary Member
Posts: 621
Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members
Thanked: 33 times

by vittalgmat » Wed Apr 15, 2009 11:52 am
I dint even undersand the Question.
@Vemuri,
does a3b mean a-cubed * b?
and does ab3 mean a * b-cubed ?
Top
Join the discussion
User avatar
Legendary Member
Posts: 682
Joined: Fri Jan 16, 2009 2:40 amFollowed by: 1 member
Thanked: 32 times

by Vemuri » Thu Apr 16, 2009 4:20 am
vittalgmat wrote:I dint even undersand the Question.
@Vemuri,
does a3b mean a-cubed * b?
and does ab3 mean a * b-cubed ?
Oppsss...sorry guys. I copy pasted the question from a website & looks like the some characters went missing. I have corrected my original post.

Sorry for the confusion. I am generally careful when posting the questions, missed it out this time :-)
Top
Join the discussion