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

Redeem

DS - exponents

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Legendary Member
Posts: 1665
Joined: Thu Nov 03, 2011 7:04 pm
Thanked: 165 times
Followed by:70 members

DS - exponents

by karthikpandian19 » Tue Jul 03, 2012 3:58 am
If a and b are different integers, does a = 0?

a^3 = (a^2)b
b = 7
Regards,
Karthik
The source of the questions that i post from JUNE 2013 is from KNEWTON

---If you find my post useful, click "Thank" :) :)---
---Never stop until cracking GMAT---
Top
Source: — Data Sufficiency |

GMAT/MBA Expert

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

by Anurag@Gurome » Tue Jul 03, 2012 4:03 am
karthikpandian19 wrote:If a and b are different integers, does a = 0?

a^3 = (a^2)b
b = 7
Statement 1: a³ = a²b
So, (a³ - a²b) = 0
--> a²(a - b) = 0
--> Either a² = 0 OR a = b

As a and b are different integers, a cannot be equal to b.
Hence, a² = 0 --> a = 0

Sufficient

Statement 2: Only thing we know is a not equal to 7.

Not sufficient

The correct answer is A.
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
Post new topic Post Reply
• Page 1 of 1