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

It is currently 18 Mar 2019, 20:57

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 a positive integer, which of the following could be a prime nu

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

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 53657
If p is a positive integer, which of the following could be a prime nu  [#permalink]

Show Tags

New post 08 Mar 2019, 03:14
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

91% (00:50) correct 9% (00:54) wrong based on 23 sessions

HideShow timer Statistics

Manager
Manager
avatar
B
Joined: 19 Mar 2018
Posts: 60
Location: India
Concentration: Operations, Strategy
GMAT 1: 600 Q42 V31
GPA: 4
WE: Operations (Energy and Utilities)
CAT Tests
Re: If p is a positive integer, which of the following could be a prime nu  [#permalink]

Show Tags

New post 08 Mar 2019, 03:46
Bunuel wrote:
If p is a positive integer, which of the following could be a prime number?

A. 8p
B. 8p + 1
C. 8p + 2
D. 8p + 4
E. 8p + 6


THE REQUIRED PRIME NUMBER MUST BE AN ODD NUMBER AS IN EACH OF THE OPTIONS 8 IS MULTIPLIED WITH p.
ONLY OPTION B HAS AN ODD NUMBER, REST OF ALL ARE EVEN NUMBERS.
HENCE, OPTION B 8p+1
VP
VP
User avatar
P
Joined: 31 Oct 2013
Posts: 1268
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If p is a positive integer, which of the following could be a prime nu  [#permalink]

Show Tags

New post 08 Mar 2019, 04:52
Bunuel wrote:
If p is a positive integer, which of the following could be a prime number?

A. 8p
B. 8p + 1
C. 8p + 2
D. 8p + 4
E. 8p + 6



Option B) 8*2 + 1 = 17. here p=2.

B is the correct answer.
Manager
Manager
avatar
B
Joined: 27 Mar 2016
Posts: 64
GMAT ToolKit User
Re: If p is a positive integer, which of the following could be a prime nu  [#permalink]

Show Tags

New post 08 Mar 2019, 07:42
option B

all are multiples of 2 except B
Target Test Prep Representative
User avatar
P
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 5357
Location: United States (CA)
Re: If p is a positive integer, which of the following could be a prime nu  [#permalink]

Show Tags

New post 11 Mar 2019, 09:40
Bunuel wrote:
If p is a positive integer, which of the following could be a prime number?

A. 8p
B. 8p + 1
C. 8p + 2
D. 8p + 4
E. 8p + 6



We see that 8p is an even number greater than 2, so 8p + 2, 8p + 4 and 8p + 6 will each be an even number greater than 2, which means none of them could be a prime number since even numbers greater than 2 are not prime numbers. Therefore, the only expression that could be a prime number is 8p + 1. This is borne out by recalling that even + odd = odd.

Answer: B
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
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

GMAT Club Bot
Re: If p is a positive integer, which of the following could be a prime nu   [#permalink] 11 Mar 2019, 09:40
Display posts from previous: Sort by

If p is a positive integer, which of the following could be a prime nu

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.