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

 It is currently 22 May 2015, 22:31

### 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

# HOw many prime numbers between 1 and 100 are factors of

Author Message
TAGS:
Manager
Joined: 23 Mar 2008
Posts: 221
Followers: 2

Kudos [?]: 39 [0], given: 0

HOw many prime numbers between 1 and 100 are factors of [#permalink]  12 May 2008, 07:52
HOw many prime numbers between 1 and 100 are factors of 7150?

a) 1
b)2
c)3
d)4
e)5
Intern
Joined: 28 Mar 2008
Posts: 35
Followers: 0

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

Re: prime numbers [#permalink]  12 May 2008, 08:30
7150 = 5*47*3*5*2*1

Current Student
Joined: 28 Dec 2004
Posts: 3390
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 13

Kudos [?]: 182 [0], given: 2

Re: prime numbers [#permalink]  12 May 2008, 08:31
puma wrote:
HOw many prime numbers between 1 and 100 are factors of 7150?

a) 1
b)2
c)3
d)4
e)5

7150=715*10 (5*2)*(5*143) (143=11*13)

so the question is how many prime number 5, 2, 5, 11, 13..5 in all E it is..

if the question is HOW MANY DIFFERENT then the answer is 4..
Intern
Joined: 29 Apr 2008
Posts: 21
Followers: 0

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

Re: prime numbers [#permalink]  12 May 2008, 09:41
7150 = 5*5*13*11*2 total 5 prime numbers
Intern
Joined: 12 May 2008
Posts: 12
Followers: 0

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

Re: prime numbers [#permalink]  12 May 2008, 13:17
In breaking down the prime factors, I stopped at 143, not seeing it broke down to 11 and 13. Is there a trick/easy way to spot that 143 isn't prime?
Re: prime numbers   [#permalink] 12 May 2008, 13:17
Similar topics Replies Last post
Similar
Topics:
7 How many prime numbers between 1 and 100 are factors of 7,15 7 20 Dec 2012, 05:35
24 How many prime numbers between 1 and 100 are factors of 7150 19 13 Apr 2009, 00:39
How many different prime numbers are factors of the positive 4 22 Oct 2006, 22:37
How many prime numbers between 1 and 100 are factors of 4 24 Aug 2006, 23:23
How many prime numbers between 1 and 100 are factors of 6 30 Apr 2006, 07:12
Display posts from previous: Sort by