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 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

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
Limited cohort · enrollment openTarget 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.

simple one

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 484
Joined: Sun Jul 30, 2006 7:01 pmFollowed by: 1 member
Thanked: 2 times
by magical cook » Tue Jan 22, 2008 9:35 pm
For any numbers a and b, a · b = a + b – ab.
If a · b = 0, which of the following CANNOT be a value of b?
(A) 2
(B) 1
(C) 0
(D) -1
(E) -2/3


simple but I got it wong... OA will follow. can you pls explain?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 423
Joined: Thu Dec 27, 2007 1:29 amFollowed by: 2 members
Location: Hyderabad, India
Thanked: 36 times
GMAT Score:770

by simplyjat » Tue Jan 22, 2008 9:56 pm
The best way is to substitute all the answer choices for the value of B in A + B - AB = 0 and try to find out the value of A...

For the second answer choice we get
=> A + 1 - A = 0
=> 1 = 0
thus B cannot have a value 1.
simplyjat
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 222
Joined: Fri Jan 04, 2008 8:10 pm
Thanked: 15 times

by sibbineni » Wed Jan 23, 2008 2:46 am
IMO B

Given Data:

a.b=a+b-ab

a.b=0

Now substitute all the choices in a+b-ab=0 ---(1)(since a.b=0)

1---> option b =2 subtitiuting in the equation 1 we have a=2

2---> option b=1 in equation 1 we have 1=0 so b cannot have a value

3---> option b=0 in equation we have a=0


4-->option b=-1 we have a=1/2


5--->option b=-2/3 we have a=2/5



in the (B) case we dont have a value......



---------------------------------
Suggest me if Iam Wrong
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1