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kaplan #13

by magical cook » Wed Aug 22, 2007 5:15 pm
13) If x is a prime number, what is the value of x?
1) X<15
2) (x-2) is a multiple of 5

Hi

Can anyone help? Correct answer will follow.
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by agps » Thu Aug 23, 2007 3:03 am
1- x<15, there are 6 prime numbers under 16 (2,3,5,7,11,13) Not sufficient
2- (x-2) multiple of 5 true for 7 and for 17, so not sufficient.

only prime number under 15 for wich x-2 is a multiple of 5 is 7.
C is the answer
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by agps » Thu Aug 23, 2007 3:03 am
1- x<15, there are 6 prime numbers under 16 (2,3,5,7,11,13) Not sufficient
2- (x-2) multiple of 5 true for 7 and for 17, so not sufficient.

only prime number under 15 for wich x-2 is a multiple of 5 is 7.
C is the answer
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by magical cook » Thu Aug 23, 2007 9:20 am
I thought C too but the correct answer is E)


Can anyone help us? :(
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by beny » Thu Aug 23, 2007 9:26 am
Kaplan claims that 0 is a multiple of 5, so the answers are 2 or 7.
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by gabriel » Thu Aug 23, 2007 9:43 am
beny wrote:Kaplan claims that 0 is a multiple of 5, so the answers are 2 or 7.
Me too had heard that 0 is a multiple of every integer .. but was not sure where .. did a little digging around and this is what i got https://mathforum.org/library/drmath/view/60913.html ...

..magical cook i hope benys response answered your query ..
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by magical cook » Thu Aug 23, 2007 10:43 am
Thank you so much for the details.

So.....in actual GMAT math rule, zero should also be considered a multiple of every integer? (hope Kaplan and GMAT rules are the same!) :)
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by beny » Thu Aug 23, 2007 10:47 am
GMAT ignores controversal issues (many people, including me, don't agree that 0 is a multiple of every number), so this type of question wouldn't likely be found on the GMAT. That's the problem I have with Kaplan; they try to use these little "tricks", which aren't at all realistic, to fool test takers.
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by magical cook » Thu Aug 23, 2007 10:48 am
Okay - so in GMAT, the answer would be C instead of E... Thank you!
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by beny » Thu Aug 23, 2007 10:51 am
magical cook wrote:Okay - so in GMAT, the answer would be C instead of E... Thank you!
No... I didn't say that. I said that this question wouldn't be found on the GMAT because many people disagree over the number properties of 0. It'd be incorrect for me to claim that GMAC agrees with my personal viewpoints over Kaplan's. 8)
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by magical cook » Thu Aug 23, 2007 10:55 am
Ooops, Okay - hope we will not see this kind of questions in GMAT...... :wink:
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by agps » Thu Aug 23, 2007 11:17 am
:evil: Kaplan has proven more than once(to me) that they can complicated as much as they can help....
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