It is currently 18 Dec 2018, 23:11
My Tests

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.

GRE Math Challenge #95-If (5^4 -1)/n is an integer

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4756
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1668 [0], given: 396

CAT Tests
GRE Math Challenge #95-If (5^4 -1)/n is an integer [#permalink] New post 09 May 2015, 11:39
Expert's post
00:00

Question Stats:

100% (02:14) correct 0% (00:00) wrong based on 3 sessions
If \(\frac{(5^4 - 1)}{n}\) is an integer an n is an integer, then n could be each of the following EXCEPT

(A) 4
(B) 6
(C) 13
(D) 25
(E) 26
[Reveal] Spoiler: OA

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

1 KUDOS received
Director
Director
Joined: 20 Apr 2016
Posts: 762
Followers: 6

Kudos [?]: 522 [1] , given: 94

CAT Tests
Re: GRE Math Challenge #95-If (5^4 +1)/n is an integer [#permalink] New post 19 Dec 2017, 11:09
1
This post received
KUDOS
sandy wrote:
If \(\frac{(5^4 - 1)}{n}\) is an integer an n is an integer, then n could be each of the following EXCEPT

(A) 4
(B) 6
(C) 13
(D) 25
(E) 26


Here,

\(\frac{(5^4 - 1)}{n}\) = \(\frac{(625 - 1)}{n}\) = \(\frac{624}{n}\)

Since n is an integer and the fraction \(\frac{624}{n}\) is an integer so the value of n could be 4,6,13 or 26.

Hence n cannot be equal to 25.
_________________

If you found this post useful, please let me know by pressing the Kudos Button

1 KUDOS received
Intern
Intern
Joined: 28 Jun 2017
Posts: 2
Followers: 0

Kudos [?]: 1 [1] , given: 2

Re: GRE Math Challenge #95-If (5^4 -1)/n is an integer [#permalink] New post 19 Dec 2017, 12:42
1
This post received
KUDOS
\(\frac{(5^4 - 1)}{n}\)

=\(\frac{624}{n}\)

=\(\frac{(2^4*3*13)}{n}\)

n could not be 25
Director
Director
Joined: 20 Apr 2016
Posts: 762
Followers: 6

Kudos [?]: 522 [0], given: 94

CAT Tests
Re: GRE Math Challenge #95-If (5^4 -1)/n is an integer [#permalink] New post 19 Dec 2017, 21:35
shawon wrote:
\(\frac{(5^4 - 1)}{n}\)

=\(\frac{624}{n}\)

=\(\frac{(2^4*3*13)}{n}\)

n could not be 25


I have edited to the correct mathematical expression

and request you to Please read - https://greprepclub.com/forum/rules-for ... html#p1783

Here there is also an explanation how to use correct mathematical expression on forum. Please read before posting
_________________

If you found this post useful, please let me know by pressing the Kudos Button

Re: GRE Math Challenge #95-If (5^4 -1)/n is an integer   [#permalink] 19 Dec 2017, 21:35
Display posts from previous: Sort by

GRE Math Challenge #95-If (5^4 -1)/n is an integer

  Question banks Downloads My Bookmarks Reviews Important topics  


GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

Powered by phpBB © phpBB Group

Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.