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How many prime numbers between 1 and 100 are factors of 7,15

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How many prime numbers between 1 and 100 are factors of 7,15 [#permalink] New post 20 Dec 2012, 06:35
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How many prime numbers between 1 and 100 are factors of 7,150 ?

(A) One
(B) Two
(C) Three
(D) Four
(E) Five
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Re: How many prime numbers between 1 and 100 are factors of 7,15 [#permalink] New post 20 Dec 2012, 06:36
Walkabout wrote:
How many prime numbers between 1 and 100 are factors of 7,150 ?

(A) One
(B) Two
(C) Three
(D) Four
(E) Five


Make prime factorization of 7,150 --> 7,150=2*5^2*11*13. So, 4 prime numbers between 1 and 100 (namely 2, 5, 11, and 13) are factors of 7,150.

Answer: D.
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Re: How many prime numbers between 1 and 100 are factors of 7,15   [#permalink] 20 Dec 2012, 06:36
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