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prime factor

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prime factor

by colakumarfanta » Wed May 19, 2010 11:13 pm
Some prime factors of 455 are prime factors of n. Only one prime factor of 455 is not a prime factor of n. What is the greatest of 455 / n?
options are 5,7,11,13,15

OA 13
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by liferocks » Thu May 20, 2010 12:22 am
455=5*7*13

So greatest 455/n is 13
And option D
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by gmatmachoman » Thu May 20, 2010 12:27 am
liferocks wrote:455=5*7*13

So greatest 455/n is 13
And option D
If they would have asked smallest integer, then:

n= 13* 7

455/(13*7)

13*7*5/(13*7)

=5

Small work ard....!!!
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