Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Mar 2610:00 AM PDT
-11:00 AM PDT
Confused about how to get the most from your GMAT mock tests? In this video, learn the perfect strategy to analyze GMAT mocks effectively and boost your score. We break down the common mistakes GMAT aspirants make when using mock tests
Mar 1910:00 AM EDT
-11:59 PM EDT
Get a massive $250 off the TTP OnDemand GMAT course by using the coupon code FLASH25 at checkout. If you prefer learning through engaging video lessons, TTP OnDemand GMAT is exactly what you need.- Mar 27
09:30 AM PDT
-10:30 AM PDT
Preparing for the GMAT? Avoid these 5 major mistakes that can lower your score and hurt your MBA dreams. In this expert panel discussion, 4 top GMAT coaches - GMAT Ninja, Jeff Miller from TTP, Rida Shafiq from eGMAT, and Chris Gentry from Manhattan Prep - Mar 27
10:00 AM PDT
-11:00 AM PDT
What happens after getting an MBA? Is it worth the investment? To find out, I interviewed 10 GMAT Club professionals who have completed their MBAs and built careers in consulting, finance, tech, and entrepreneurship. Their answers might surprise you! 
Mar 2911:30 AM EDT
-12:30 PM EDT
Learn how Keshav, a Chartered Accountant, scored an impressive 705 on GMAT in just 30 days with GMATWhiz's expert guidance. In this video, he shares preparation tips and strategies that worked for him, including the mock, time management, and more.
Mar 3005:30 AM PDT
-07:30 AM PDT
We know Strengthen and Weaken questions account for more than 50% of the CR questions on the GMAT. With CR becoming even more important on GMAT Focus, it's time you strengthen your weaknesses with an approach that improves your solving time and accuracy!
Mar 3011:00 AM IST
-01:00 PM IST
Attend this session to evaluate your current skill level, learn process skills, and solve through tough Arithmetic questions.
Mar 3110:00 AM EDT
-11:59 PM EDT
The Target Test Prep team has recently introduced TTP OnDemand GMAT, a 400-hour live masterclass video course created by Scott Woodbury-Stewart, founder and CEO of Target Test Prep.
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
71% (01:35) correct
29%
(01:58)
wrong
based on 1156
sessions
History
Date
Time
Result
Not Attempted Yet
If # represents one of the operations +,- and *, is a # (b-c) = (a#b) – (a#c) for all numbers a, b and c.
(1) a#1 is not equal to 1#a for some numbers a
(2) # represents subtraction
(1) a#1 is not equal to 1#a for some numbers a
(2) # represents subtraction
20 Sep 2010, 00:14
Kudos
Bookmarks
BalakumaranP
IMO, it cannot be "not equal" always.
If # is subtraction,
a#(b-c)=a-(b-c)=a-b+c
(a#b)-(a#c)=(a-b)-(a-c)=a-b-a+c=-b+c
a-b+c=-b+c when a=0 and not equal for other values.. So both are insufficient.. Am I missing something here?
If # is subtraction,
a#(b-c)=a-(b-c)=a-b+c
(a#b)-(a#c)=(a-b)-(a-c)=a-b-a+c=-b+c
a-b+c=-b+c when a=0 and not equal for other values.. So both are insufficient.. Am I missing something here?
If # represents one of the operations +, - and *, is \(a#(b-c)=(a#b)-(a#c)\) for all numbers \(a\), \(b\) and \(c\).
(1) \(a#1\) is not equal to \(1#a\) for some numbers \(a\).
\(#\) is neither addition (as \(a+1=1+a\)) not multiplication (as \(a*1=1*a\)), so \(#\) is a subtraction. Then \(LHS=a#(b-c)=a-b+c\) and \(RHS=(a#b)-(a#c)=(a-b)-(a-c)=c-b\), so the question becomes "is \(a-b+c=c-b\) for all numbers \(a\), \(b\) and \(c\)?" --> "is \(a=0\)". So when \(a=0\) (and \(#\) is a subtraction) then \(a#(b-c)=(a#b)-(a#c)\) holds true but not for other values of \(a\), so not for all numbers \(a\), \(b\) and \(c\). Answer to the question is NO. Sufficient.
(2) \(#\) represents subtraction --> the same as above. Sufficient.
Answer: D.
Hope it's clear.
General Discussion
19 Sep 2010, 15:58
Kudos
Bookmarks
I converted question to 3 euqations where # can be +, - or *
So
I) When # = *
ab-ac = ab-ac (true for all values)
II) When # = +
Is a+b-c=b-c
III) When #=-
Is a-b+c = -b-c?
With option A we know # is not * as 1*a is always equal to a*1. So given equation is not equal
With option B , equation is not equal.
So answer choice D
So
I) When # = *
ab-ac = ab-ac (true for all values)
II) When # = +
Is a+b-c=b-c
III) When #=-
Is a-b+c = -b-c?
With option A we know # is not * as 1*a is always equal to a*1. So given equation is not equal
With option B , equation is not equal.
So answer choice D
