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

It is currently 19 Oct 2019, 02:56

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 p is an integer greater than 1, is p a prime number?

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

Hide Tags

Find Similar Topics 
Ryerson (Ted Rogers) Thread Master
User avatar
Joined: 27 Sep 2015
Posts: 55
Location: Canada
GMAT 1: 410 Q33 V13
WE: Management Consulting (Computer Software)
GMAT ToolKit User
If p is an integer greater than 1, is p a prime number?  [#permalink]

Show Tags

New post 21 Dec 2015, 16:00
2
6
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

73% (00:47) correct 27% (00:55) wrong based on 184 sessions

HideShow timer Statistics

If p is an integer greater than 1, is p a prime number?

(1) \(p\) is a factor of 13
(2) \(p\) is a factor of 78

_________________
Discipline does not mean control. Discipline means having the sense to do exactly what is needed.
CEO
CEO
avatar
S
Joined: 20 Mar 2014
Posts: 2597
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: If p is an integer greater than 1, is p a prime number?  [#permalink]

Show Tags

New post 21 Dec 2015, 18:56
1
RSOHAL wrote:
If p is an integer greater than 1, is p a prime number?

(1) \(p\) is a factor of 13
(2) \(p\) is a factor of 78


The question asks whether p is a prime number.

Per statement 1, p is a factor of 13 and as such there are only 2 possible values of p = 1 or 13. But as it is given than p>1, p=13 is the only allowed value. Sufficient

Per statement 2, p is a factor of 78, thus p = 2 or 6 or 13 and you end up getting primes = 2 or 3 but also non primes = 6 or 78. Hence not sufficient.

A is the correct answer.
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 12 Sep 2015
Posts: 4009
Location: Canada
Re: If p is an integer greater than 1, is p a prime number?  [#permalink]

Show Tags

New post 02 May 2018, 09:00
2
Top Contributor
RSOHAL wrote:
If p is an integer greater than 1, is p a prime number?

(1) \(p\) is a factor of 13
(2) \(p\) is a factor of 78


Target question: Is p a prime number?

Given: p is an integer greater than 1

Statement 1: p is a factor of 13
The only positive factors of 13 are 1 and 13
Since we're told that p is greater than 1, we can conclude that p MUST equal 13
So, the answer to the target question is YES, p IS a prime number
Since we can answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: p is a factor of 78
The positive factors of 78 are 1, 2, 3, 6, 13, 26, 39 and 78
Since we're told that p is greater than 1, we can conclude that p COULD equal 2, 3, 6, 13, 26, 39 or 78
If p = 2, then the answer to the target question is YES, p IS a prime number
If p = 6, then the answer to the target question is NO, p is NOT a prime number
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT

Answer: A

Cheers,
Brent
_________________
Test confidently with gmatprepnow.com
Image
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 13266
Re: If p is an integer greater than 1, is p a prime number?  [#permalink]

Show Tags

New post 13 Sep 2019, 23:58
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
GMAT Club Bot
Re: If p is an integer greater than 1, is p a prime number?   [#permalink] 13 Sep 2019, 23:58
Display posts from previous: Sort by

If p is an integer greater than 1, is p a prime number?

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





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