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

It is currently 26 Jul 2014, 11:22

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

1)If each of the +ve integers a,b and c are prime numbers

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 11 Mar 2006
Posts: 2
Followers: 0

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

1)If each of the +ve integers a,b and c are prime numbers [#permalink] New post 02 May 2006, 08:37
(1)If each of the +ve integers a,b and c are prime
numbers with abc=30,then c=?
(1)a<b<c
(2)a-b=c
>
I chose A as my solution is 2*3*5 = 30 where a=2,b=3
and c=5 and thus a<b<c
I rejected the 2nd statement because when a=5,b=2 then
c=5-2=3 and when a=5,b=3 then c=5-3=2

Thus we get 2 diff values of 'c' viz 2 and 3 when we consider the second statement,but the official answer gives 'D' as the correct answer.Can you tell me how the second statement gives the exact value of 'c'
Manager
Manager
avatar
Joined: 14 Mar 2006
Posts: 214
Followers: 1

Kudos [?]: 2 [0], given: 0

GMAT Tests User
Re: a,b,c integer question [#permalink] New post 02 May 2006, 08:52
fewjun wrote:
(1)If each of the +ve integers a,b and c are prime
numbers with abc=30,then c=?
(1)a<b<c
(2)a-b=c
>
I chose A as my solution is 2*3*5 = 30 where a=2,b=3
and c=5 and thus a<b<c
I rejected the 2nd statement because when a=5,b=2 then
c=5-2=3 and when a=5,b=3 then c=5-3=2

Thus we get 2 diff values of 'c' viz 2 and 3 when we consider the second statement,but the official answer gives 'D' as the correct answer.Can you tell me how the second statement gives the exact value of 'c'


I tend to agree with you, (2) does give two values for C, unless I am missing something really important.
Director
Director
avatar
Joined: 16 Aug 2005
Posts: 950
Location: France
Followers: 1

Kudos [?]: 8 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 May 2006, 11:51
You are right, D is not the correct answer, it should be A
Manager
Manager
avatar
Joined: 14 Mar 2006
Posts: 214
Followers: 1

Kudos [?]: 2 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 May 2006, 16:35
What is the source of this question? If you don't mind.
Intern
Intern
avatar
Joined: 11 Mar 2006
Posts: 2
Followers: 0

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

 [#permalink] New post 02 May 2006, 16:50
gmat plus book 4..question # 111

Can someone verify if this is accurate?
VP
VP
User avatar
Joined: 29 Dec 2005
Posts: 1351
Followers: 6

Kudos [?]: 27 [0], given: 0

GMAT Tests User
Re: a,b,c integer question [#permalink] New post 02 May 2006, 17:07
fewjun wrote:
(1)If each of the +ve integers a,b and c are prime
numbers with abc=30,then c=?

(1)a<b<c
(2)a-b=c

I chose A as my solution is 2*3*5 = 30 where a=2, b=3 and c=5 and thus a<b<c. I rejected the 2nd statement because when a=5,b=2 then
c=5-2=3 and when a=5,b=3 then c=5-3=2

Thus we get 2 diff values of 'c' viz 2 and 3 when we consider the second statement,but the official answer gives 'D' as the correct answer.Can you tell me how the second statement gives the exact value of 'c'


we can easily disput with the OA given if OE given is not justifiable.
make sure you posted the question correctly.
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5097
Location: Singapore
Followers: 16

Kudos [?]: 131 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 May 2006, 17:14
St1:
a,b and c are prime.

a<b<c --> a=2,b=3,c=5 then abc = 30 and c = 5

Sufficient.

St2:
a-b = c
If a = b+c

If a = 5, b = 3, c = 2 then abc = 30 and c = 2
If a = 5, b = 2, c = 3, then abc = 30 and c = 3.

Insufficient.

Ans A

I cannot think of a reason why D should be the answer.
  [#permalink] 02 May 2006, 17:14
    Similar topics Author Replies Last post
Similar
Topics:
Is a+b divisible by 7? a and b are both +ve integers. 1) a paam0101 3 04 Aug 2010, 10:29
1 1:if x and 10 are relatively prime natural numbers, then x charles77479a 7 17 Sep 2008, 03:00
h is an integer greater than 1,is h a prime number? 1) each nitinneha 4 17 Dec 2006, 20:54
If x^1/2 is a +ve integer, is x^1/2 a prime number ? I. x is banerjeea_98 6 03 Feb 2005, 19:11
h is an integer greater than 1,is h a prime number? 1) each afife76 4 08 Aug 2004, 21:08
Display posts from previous: Sort by

1)If each of the +ve integers a,b and c are prime numbers

  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®.