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Please, help: GMAT Club Tests 24 Q. # 36 [#permalink]
 29 Apr 2012, 10:35
Question Stats:
33% (02:10) correct
66% (02:16) wrong based on 0 sessions
Sorry for the re-opening of the forum discussion on the Gmatclub tetsts 24 Q #36 which has been already discussed under the following link: gmat-math-test-number-properties-3-qn-85845.htmlBut I want to clarify one point which was not clarified by the discussion run on the link referred above ( at least it is not clear to me) The problem is: How many divisors does positive integer N have?
1) The difference between the largest and the smallest divisor of N is 21
2) N+1 has 2 divisorsHere is a point which is not clear to me: whether negative integers can, from the official GMAT tests' point, be considered divisors of a positive integer? Regarding of the problem given here, whether -20 can be taken as a divisor of N? If "yes", then the condition (1) must also not be sufficient. Insofar as I know the problem does not specify that a divisor of N must be a positive integer. Taking this into account one may on the basis of the problem assume that except zero any integer, regardless -ve or +ve one, can be a divisor of N provided the result must be a whole number.Thanks for your help and + 1 kudos for any clarification. 
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Re: Please, help: GMAT Club Tests 24 Q. # 36 [#permalink]
30 Apr 2012, 04:28
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feruz77 wrote: Sorry for the re-opening of the forum discussion on the Gmatclub tetsts 24 Q #36 which has been already discussed under the following link: gmat-math-test-number-properties-3-qn-85845.htmlBut I want to clarify one point which was not clarified by the discussion run on the link referred above ( at least it is not clear to me) The problem is: How many divisors does positive integer N have?
1) The difference between the largest and the smallest divisor of N is 21
2) N+1 has 2 divisorsHere is a point which is not clear to me: whether negative integers can, from the official GMAT tests' point, be considered divisors of a positive integer? Regarding of the problem given here, whether -20 can be taken as a divisor of N? If "yes", then the condition (1) must also not be sufficient. Insofar as I know the problem does not specify that a divisor of N must be a positive integer. Taking this into account one may on the basis of the problem assume that except zero any integer, regardless -ve or +ve one, can be a divisor of N provided the result must be a whole number.Thanks for your help and + 1 kudos for any clarification. For example, every GMAT divisibility question will tell you in advance that any unknowns represent positive integers.
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Re: Please, help: GMAT Club Tests 24 Q. # 36 [#permalink]
30 Apr 2012, 05:55
Bunuel wrote: feruz77 wrote: Sorry for the re-opening of the forum discussion on the Gmatclub tetsts 24 Q #36 which has been already discussed under the following link: gmat-math-test-number-properties-3-qn-85845.htmlBut I want to clarify one point which was not clarified by the discussion run on the link referred above ( at least it is not clear to me) The problem is: How many divisors does positive integer N have?
1) The difference between the largest and the smallest divisor of N is 21
2) N+1 has 2 divisorsHere is a point which is not clear to me: whether negative integers can, from the official GMAT tests' point, be considered divisors of a positive integer? Regarding of the problem given here, whether -20 can be taken as a divisor of N? If "yes", then the condition (1) must also not be sufficient. Insofar as I know the problem does not specify that a divisor of N must be a positive integer. Taking this into account one may on the basis of the problem assume that except zero any integer, regardless -ve or +ve one, can be a divisor of N provided the result must be a whole number.Thanks for your help and + 1 kudos for any clarification. For example, every GMAT divisibility question will tell you in advance that any unknowns represent positive integers. Many thanks to you, Bunuel. I highly appreciate your help.
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Re: Please, help: GMAT Club Tests 24 Q. # 36
[#permalink]
30 Apr 2012, 05:55
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