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

Author Message
Manager
Joined: 23 Mar 2008
Posts: 218
HOw many prime numbers between 1 and 100 are factors of [#permalink]

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12 May 2008, 08:52
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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: 34

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12 May 2008, 09:30
7150 = 5*47*3*5*2*1

Current Student
Joined: 28 Dec 2004
Posts: 3357
Location: New York City
Schools: Wharton'11 HBS'12

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12 May 2008, 09:31
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

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12 May 2008, 10:41
7150 = 5*5*13*11*2 total 5 prime numbers
Intern
Joined: 12 May 2008
Posts: 12

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12 May 2008, 14:17
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, 14:17
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