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# If p is a positive integer,how many trailing zeros does p have?

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Current Student
Joined: 12 Aug 2015
Posts: 2627
Schools: Boston U '20 (M)
GRE 1: Q169 V154
If p is a positive integer,how many trailing zeros does p have?  [#permalink]

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24 Nov 2016, 13:39
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Difficulty:

35% (medium)

Question Stats:

58% (00:54) correct 42% (00:52) wrong based on 59 sessions

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If p is a positive integer,how many trailing zeros does p have?

(1)5 is a prime factor of p.
(2)2 is not a prime factor of p.

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Current Student
Joined: 28 Nov 2014
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Re: If p is a positive integer,how many trailing zeros does p have?  [#permalink]

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25 Nov 2016, 02:30
Statement 1: 5 is a prime factor of p.
This means p= 5*(something)
This does not confirm the # of 5s in p. Also, we are not sure if 2 is a prime factor of p.
Insufficient

Statement 2: 2 is NOT a prime factor of p. This means the positive integer p will not have any trailing zeroes.

B is sufficient

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Intern
Joined: 16 Mar 2017
Posts: 10
GMAT 1: 640 Q48 V30
GPA: 3.87
If p is a positive integer,how many trailing zeros does p have?  [#permalink]

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23 Oct 2017, 05:29
We can find the number of trailing zeros p has by dividing by powers of 5 until 5^k<p. How can we find the number of trailing zeros in p only by knowing the 2 is not a prime factor of p?

Thanks
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If p is a positive integer,how many trailing zeros does p have? &nbs [#permalink] 23 Oct 2017, 05:29
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# If p is a positive integer,how many trailing zeros does p have?

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