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

It is currently 14 Oct 2019, 08:49

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

Which of the following is NOT a prime factor of (5^6−2^6)?

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

Hide Tags

Find Similar Topics 
Manager
Manager
User avatar
B
Joined: 14 Jan 2013
Posts: 130
Concentration: Strategy, Technology
GMAT Date: 08-01-2013
GPA: 3.7
WE: Consulting (Consulting)
Which of the following is NOT a prime factor of (5^6−2^6)?  [#permalink]

Show Tags

New post Updated on: 19 Jan 2014, 09:21
1
11
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

66% (02:07) correct 34% (02:07) wrong based on 235 sessions

HideShow timer Statistics

Which of the following is NOT a prime factor of (5^6−2^6)?

A. 3
B. 7
C. 13
D. 17
E. 19

Originally posted by HarveyS on 19 Jan 2014, 01:15.
Last edited by Bunuel on 19 Jan 2014, 09:21, edited 1 time in total.
Edited the question.
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58316
Re: Which of the following is NOT a prime factor of (5^6−2^6)?  [#permalink]

Show Tags

New post 19 Jan 2014, 09:25
1
1
Manager
Manager
avatar
Joined: 04 Oct 2013
Posts: 150
Location: India
GMAT Date: 05-23-2015
GPA: 3.45
GMAT ToolKit User Reviews Badge
Re: Which of the following is NOT a prime factor of (5^6−2^6)?  [#permalink]

Show Tags

New post 19 Jan 2014, 22:45
1
Which of the following is NOT a prime factor of \((5^6 - 2^6)?\)

A. 3
B. 7
C. 13
D. 17
E. 19


\((5^6 - 2^6)\)
\(=(5^3 - 2^3)(5^3 + 2^3)
=(5-2)(5^2+5*2+2^2)(5+2)(5^2-5*2+2^2)
=3*39*7*19
=3*3*13*7*19\)

Answer: (D)
Intern
Intern
avatar
Joined: 24 Mar 2014
Posts: 34
Location: United States
GMAT 1: 700 Q50 V35
WE: Project Management (Computer Software)
Which of the following is NOT a prime factor of (5^6−2^6) ?  [#permalink]

Show Tags

New post 31 Jul 2015, 11:05
2
Which of the following is NOT a prime factor of (5^6−2^6) ?

a)3
b)7
c)13
d)17
e)19
CEO
CEO
avatar
S
Joined: 20 Mar 2014
Posts: 2603
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE: Engineering (Aerospace and Defense)
GMAT ToolKit User Reviews Badge
Re: Which of the following is NOT a prime factor of (5^6−2^6)?  [#permalink]

Show Tags

New post 31 Jul 2015, 11:16
Gmat1008 wrote:
Which of the following is NOT a prime factor of (5^6−2^6) ?

a)3
b)7
c)13
d)17
e)19


Please search for a question before you post.

Topics merged.
Target Test Prep Representative
User avatar
D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 8040
Location: United States (CA)
Re: Which of the following is NOT a prime factor of (5^6−2^6)?  [#permalink]

Show Tags

New post 10 Aug 2017, 10:45
HarveyS wrote:
Which of the following is NOT a prime factor of (5^6−2^6)?

A. 3
B. 7
C. 13
D. 17
E. 19


Let’s simplify the given expression:

5^6 − 2^6 = (5^3 + 2^3)(5^3 - 2^3) = (125 + 8)(125 - 8) = (133)(117) = (7 x 19) x (3 x 3 x 13)

We see that the only answer choice that divides into (133)(117) is 17.

Answer: D
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Director
Director
avatar
G
Joined: 09 Mar 2018
Posts: 997
Location: India
Re: Which of the following is NOT a prime factor of (5^6−2^6)?  [#permalink]

Show Tags

New post 15 Feb 2019, 07:49
HarveyS wrote:
Which of the following is NOT a prime factor of (5^6−2^6)?

A. 3
B. 7
C. 13
D. 17
E. 19



(5^6−2^6)

(5^3 - 2^3) (5^3 + 2^3)

3*13*3*7*19

Only D is missing here
_________________
If you notice any discrepancy in my reasoning, please let me know. Lets improve together.

Quote which i can relate to.
Many of life's failures happen with people who do not realize how close they were to success when they gave up.
GMAT Club Bot
Re: Which of the following is NOT a prime factor of (5^6−2^6)?   [#permalink] 15 Feb 2019, 07:49
Display posts from previous: Sort by

Which of the following is NOT a prime factor of (5^6−2^6)?

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





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