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Data-Sufficiency from Kaplan practice GMAT

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by JBGolf35 » Tue Feb 27, 2007 2:52 pm
If x is a prime number, what is the value of x?

(i) x < 15

(ii) (x-2) is a multiple of 5


(i) is obviously not sufficient - it could be 2, 3, 5, ....

(ii) is not sufficient either - could be 17, 37, etc...

Together, though, it seems the answer is x = 7. Why is it that you need more information?
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by Neo2000 » Tue Feb 27, 2007 8:36 pm
If X = 2??
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by JBGolf35 » Wed Feb 28, 2007 12:50 pm
That is correct. I had not known that 0 is considered a multiple of every number. Thanks.
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by pankajks2010 » Sat May 14, 2011 2:25 pm
Individually, both the statements have been evaluated and are insufficient.

Ideally, in GMAT 0 is not considered a multiple. Despite this, even if we combine the statements, it would be insufficient to answer the question.

Two cases arise, x=7 & x=12. Thus, E
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by smackmartine » Sat May 14, 2011 2:48 pm
IMO E
Two cases arise, x=7 & x=12. Thus, E
pankajks2010 ,When you combine both th statements, you cannot select x=12 because x must be a prime number (according to the question) and 12 is not!

But you are correct that 0 is a multiple of all numbers

Whats the OA?
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by pankajks2010 » Sat May 14, 2011 5:08 pm
Sorry, I do not have the OA.

Thanks for pointing out that I was missing a key condition provided in the question. :)
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