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HOw many prime numbers between 1 and 100 are factors of

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Manager
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HOw many prime numbers between 1 and 100 are factors of [#permalink] New post 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
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Re: prime numbers [#permalink] New post 12 May 2008, 08:30
7150 = 5*47*3*5*2*1

5 is the answer
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Re: prime numbers [#permalink] New post 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..
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Re: prime numbers [#permalink] New post 12 May 2008, 09:41
7150 = 5*5*13*11*2 total 5 prime numbers
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Re: prime numbers [#permalink] New post 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
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HOw many prime numbers between 1 and 100 are factors of

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