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 Post subject: Isn't 0 divisible by any non zero number?
 Post Posted: Tue Jun 02, 2009 11:16 am 
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Posts: 23
Here is the question and the answer(explaination). The Answer is C, if 0 is not divisible by 3, else the answer should be E. My question is isnt 0 divisible by 3, because it leaves a reminder of 0. So shouldnt the answer be E.

Please advise.

Thanks in advance

If x is a positive integer, is x - 1 a factor of 104?

(1) x is divisible by 3.

(2) 27 is divisible by x





The factors of 104 are {1, 2, 4, 8, 13, 26, 52, 104}. If x - 1 is definitely one of these factors, OR if x - 1 is definitely NOT one of these factors, then the statement is sufficient.

(1) INSUFFICIENT: x could be any one of the infinite multiples of 3. If x = 3, x - 1 would equal 2, which is a factor of 104. If x = 6, x - 1 would equal 5, which is not a factor of 104.

(2) INSUFFICIENT: The factors of 27 are {1, 3, 9, 27}. Subtracting 1 from each of these values yields the set {0, 2, 8, 26}. The non-zero values are all factors of 104, but 0 is not.

(1) AND (2) SUFFICIENT: Given that x is a factor of 27 and also divisible by 3, x must equal one of 3, 9 or 27. x - 1 must therefore equal one of 2, 8, or 26 - all factors of 104.

The correct answer is C.


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 Post subject: Re: Isn't 0 divisible by any non zero number?
 Post Posted: Thu Jun 04, 2009 11:03 am 
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Posts: 23
PLEASE IGNORE THIS QUESTION.


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 Post subject: Re: Isn't 0 divisible by any non zero number?
 Post Posted: Mon Jul 13, 2009 6:25 am 
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ManhattanGMAT Staff


Posts: 13427
for any other posters out there reading this post:

you don't have to consider the issue of whether x can be 0, because the problem statement stipulates that x must be a positive integer.

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 Post subject: Re: Isn't 0 divisible by any non zero number?
 Post Posted: Thu Oct 07, 2010 2:26 pm 
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Students


Posts: 5
I answered B because I did not consider 1 as a possible divisor of 27, since 1 is a universal divisor.
I am curious to know if GMAT official testers would consider such problems. Could you share a similar problem from the OG or Quant guide, in which if 1 is not considered as a divisor the solution would be incorrect?

Also I thought this problem is confusing enough to deserve a 700-800 category.


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 Post subject: Re: Isn't 0 divisible by any non zero number?
 Post Posted: Fri Oct 08, 2010 1:07 am 
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ManhattanGMAT Staff


Posts: 5065
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i don't have a specific question in mind, but the GMAT's math is always correct, so you can assume they would consider 1 a divisor of any integer.. :)

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