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DS: is x=1?

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youenr
 Post subject: DS: is x=1?
 Post Posted: Tue Jan 24, 2012 1:57 pm 
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Course Students


Posts: 5
If x and y are greater than 0, is x=1?
1- x/y=1
2- xy=1

I thought B was enough but apparently the answer is C !?
Can someone help on this one?
Thanks
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stud.jatt
 Post subject: Re: DS: is x=1?
 Post Posted: Tue Jan 24, 2012 4:20 pm 
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Students


Posts: 21
Statement 2 is in no way sufficient. It states that xy = 1, take the case when x = 5 , y = 1/5, we have xy = 1

I think you erred here as you made the wrong assumption that x and y are integers and hence deduced that the only way x*y could equal 1 was if both x and y are equal to 1.



youenr wrote:
If x and y are greater than 0, is x=1?
1- x/y=1
2- xy=1

I thought B was enough but apparently the answer is C !?
Can someone help on this one?
Thanks
Top 
jnelson0612
 Post subject: Re: DS: is x=1?
 Post Posted: Tue Jan 24, 2012 11:13 pm 
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ManhattanGMAT Staff


Posts: 1857
Yes, I believe that stud.jatt is correct. Beware of assuming that x and y are integers; they only must be greater than 0. Let us know if you need more help.

_________________
Jamie Nelson
ManhattanGMAT Instructor
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youenr
 Post subject: Re: DS: is x=1?
 Post Posted: Wed Jan 25, 2012 12:11 am 
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Course Students


Posts: 5
Thank you for your help. I got it now.
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RonPurewal
 Post subject: Re: DS: is x=1?
 Post Posted: Thu Jan 26, 2012 2:34 am 
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ManhattanGMAT Staff


Posts: 7146
awesome
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