GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 15 Oct 2019, 17:30

Close

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

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

If a^b = 289, what is the value of a-b? (1) b is not equal to 1

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Senior Manager
Senior Manager
avatar
P
Joined: 27 Aug 2014
Posts: 337
Location: Netherlands
Concentration: Finance, Strategy
Schools: LBS '22, ISB '21
GPA: 3.9
WE: Analyst (Energy and Utilities)
If a^b = 289, what is the value of a-b? (1) b is not equal to 1  [#permalink]

Show Tags

New post 24 Sep 2018, 14:20
5
00:00
A
B
C
D
E

Difficulty:

  65% (hard)

Question Stats:

35% (01:09) correct 65% (01:36) wrong based on 29 sessions

HideShow timer Statistics

If a^b = 289, what is the value of a - b?

(1) b is not equal to 1
(2) a and b are integers
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 12 Sep 2015
Posts: 4003
Location: Canada
Re: If a^b = 289, what is the value of a-b? (1) b is not equal to 1  [#permalink]

Show Tags

New post 24 Sep 2018, 16:34
1
Top Contributor
santorasantu wrote:
If a^b = 289, what is the value of a-b?

1. b is not equal to 1
2. a and b are integers


Target question: What is the value of a-b?

Given: a^b = 289

Jump straight to....

Statements 1 and 2 combined
There are several values of a and b that satisfy BOTH statements. Here are two:
Case a: a = 17 and b = 2. Notice that 17^2 = 289. In this case, the answer to the target question is a - b = 17 - 2 = 15
Case b: a = -17 and b = 2. Notice that (-17)^2 = 289. In this case, the answer to the target question is a - b = -17 - 2 = -19
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

Answer: E

Cheers,
Brent
_________________
Test confidently with gmatprepnow.com
Image
GMAT Club Bot
Re: If a^b = 289, what is the value of a-b? (1) b is not equal to 1   [#permalink] 24 Sep 2018, 16:34
Display posts from previous: Sort by

If a^b = 289, what is the value of a-b? (1) b is not equal to 1

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne