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

 It is currently 19 Jun 2018, 20:54

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Integer m has 4 different prime factors and n has 3

Author Message
Current Student
Joined: 11 May 2008
Posts: 551
Integer m has 4 different prime factors and n has 3 [#permalink]

### Show Tags

Updated on: 01 Aug 2008, 08:55
. Integer m has 4 different prime factors and n has 3 different prime factors. If m and n has the greatest common prime factor of 15, how many different prime factors does m*n have?
A. 4
B. 5
C. 6
D. 7
E. 8

ignore the part in the red...
the ans should be 2common(3,5)along with 2 factors from m, and 1 from n
so 2+2+1=5

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

Originally posted by arjtryarjtry on 01 Aug 2008, 04:33.
Last edited by arjtryarjtry on 01 Aug 2008, 08:55, edited 2 times in total.
Senior Manager
Joined: 16 Jul 2008
Posts: 279

### Show Tags

01 Aug 2008, 05:37
arjtryarjtry wrote:
If m and n has the greatest common prime factor of 15

I don't get this. 15 is the least common denominator or something else?
_________________

http://applicant.wordpress.com/

Current Student
Joined: 12 Jun 2008
Posts: 287
Schools: INSEAD Class of July '10

### Show Tags

01 Aug 2008, 06:35
arjtryarjtry wrote:
. Integer m has 4 different prime factors and n has 3 different prime factors. If m and n has the greatest common prime factor of 15, how many different prime factors does m*n have?
A. 4
B. 5
C. 6
D. 7
E. 8

Excuse me but 15 is not prime. What is the exact question ?
SVP
Joined: 07 Nov 2007
Posts: 1738
Location: New York

### Show Tags

01 Aug 2008, 08:38
arjtryarjtry wrote:
. Integer m has 4 different prime factors and n has 3 different prime factors. If m and n has the greatest common prime factor of 15, how many different prime factors does m*n have?
A. 4
B. 5
C. 6
D. 7
E. 8

I got B

M 3 * 5 * 7 * 11
N 2 * 3* 5
M *N --> 2*3*5*7*11 PRIM FACTORS
_________________

Smiling wins more friends than frowning

SVP
Joined: 07 Nov 2007
Posts: 1738
Location: New York

### Show Tags

01 Aug 2008, 08:45
Oski wrote:
arjtryarjtry wrote:
. Integer m has 4 different prime factors and n has 3 different prime factors. If m and n has the greatest common prime factor of 15, how many different prime factors does m*n have?
A. 4
B. 5
C. 6
D. 7
E. 8

Excuse me but 15 is not prime. What is the exact question ?

Looks like question intention is
greatest common prime factor of 15 = 3 * 5 great common prime factors of m and n
_________________

Smiling wins more friends than frowning

Current Student
Joined: 11 May 2008
Posts: 551

### Show Tags

01 Aug 2008, 08:54
sorry guys.. the error will be rectified...

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: prime factors ...   [#permalink] 01 Aug 2008, 08:54
Display posts from previous: Sort by

# Integer m has 4 different prime factors and n has 3

Moderator: chetan2u

 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®.