Find all School-related info fast with the new School-Specific MBA Forum

It is currently 01 Aug 2014, 23:15

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If x is a prime number, what is the value of x?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 02 Jun 2011
Posts: 160
Followers: 1

Kudos [?]: 17 [0], given: 11

If x is a prime number, what is the value of x? [#permalink] New post 27 Mar 2012, 13:07
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

28% (01:31) correct 72% (00:27) wrong based on 25 sessions
If x is a prime number, what is the value of x?

(1) x is less than 15
(2) (x-2) is multiple of 5.


first thing x is prime given in question.
st. 1.) gives the options 2,3,5,7,11,13 so not sufficient
st. 2.) for x-2 to be a multiple of 5 x could be 7, 17 etc as the question says x to be prime
but st 2. not suffiecient

together isnt the only option is 7 ?
as st. 1. says less than 15 and st. 2 states x-2 is multiple of 5
shouldn't the answer be c? given as E.
[Reveal] Spoiler: OA
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18861
Followers: 3279

Kudos [?]: 22986 [0], given: 2653

Re: If x is a prime number, what is the value of x? [#permalink] New post 27 Mar 2012, 13:15
Expert's post
kashishh wrote:
If x is a prime number, what is the value of x?

(1) x is less than 15
(2) (x-2) is multiple of 5.


first thing x is prime given in question.
st. 1.) gives the options 2,3,5,7,11,13 so not sufficient
st. 2.) for x-2 to be a multiple of 5 x could be 7, 17 etc as the question says x to be prime
but st 2. not suffiecient

together isnt the only option is 7 ?
as st. 1. says less than 15 and st. 2 states x-2 is multiple of 5
shouldn't the answer be c? given as E.


If x is a prime number, what is the value of x?

(1) x is less than 15 --> x can be 2, 3, 5, 7, 11, or 13. Not sufficient.
(2) (x-2) is multiple of 5 --> also not sufficient, since x can take more than 1 value, for example 2, 7, 17, ... Not sufficient.

Notice that 2 is a possible value for x, since 2-2=0 and zero is a multiple of every integer (except zero itself), so it's a multiple of 5 too.

(1)+(2) x can still be 2 or 7. Not sufficient.

Answer: E.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: If x is a prime number, what is the value of x?   [#permalink] 27 Mar 2012, 13:15
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic If x is a prime number, what is the value of x? ruturaj 9 09 Aug 2011, 20:50
If x is a prime number what is the value of x? a) There are gsaxena26 5 25 Jun 2011, 03:58
11 Experts publish their posts in the topic If x is a prime number, what is the value of x? msunny 9 23 Dec 2009, 09:16
If x is a prime number, what is the value of x? meesawoosa 3 12 Apr 2009, 22:25
If x is a prime number, what is the value of x? above720 3 17 May 2007, 17:07
Display posts from previous: Sort by

If x is a prime number, what is the value of x?

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.