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07 Jun 2009, 21:22
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All participants, Please explain your answers
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07 Jun 2009, 23:28
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I would do the second question first.
Now, we are to find if x and y are positive. Let us assume that x and y are integers.
According to (1) 2x - 2y = 1
if x= 1 y= 1/2, if x= 3/2 y= 1, if x= 2 y= 3/2, if x= -1 y= -3/2, if x= -1/2 y= -1 and so on... the statement is not self sufficient to conclude.
Second statement, x/y> 1
if x=1 y= 1/2, and when x= -1/2 y=-1, then only we get x/y > 1. Still we don't come to a conclusion.
Now even if we combine the 2 statements, we would not be ale to decide the sign of x and y.
Therefore, I go for 'E'.
The first question. 'k' lies between 1 and 10 inclusive. Since (-1)^k+1, therefore for every even value the term would be odd and for even odd value the term would be even. The terms that we get are 1/2, -1/4, 1/8, -1/16...-1/1024. by subtracting the successive terms we get all positive terms 1/4, 1/16, 1/64... 1/1024. now we add these terms, so if answer would be greater than 1/4 but, since the terms being added to 1/4 are very small, the answer would lie between 1/2 and 1/4, so I go for 'D'.
Now, we are to find if x and y are positive. Let us assume that x and y are integers.
According to (1) 2x - 2y = 1
if x= 1 y= 1/2, if x= 3/2 y= 1, if x= 2 y= 3/2, if x= -1 y= -3/2, if x= -1/2 y= -1 and so on... the statement is not self sufficient to conclude.
Second statement, x/y> 1
if x=1 y= 1/2, and when x= -1/2 y=-1, then only we get x/y > 1. Still we don't come to a conclusion.
Now even if we combine the 2 statements, we would not be ale to decide the sign of x and y.
Therefore, I go for 'E'.
The first question. 'k' lies between 1 and 10 inclusive. Since (-1)^k+1, therefore for every even value the term would be odd and for even odd value the term would be even. The terms that we get are 1/2, -1/4, 1/8, -1/16...-1/1024. by subtracting the successive terms we get all positive terms 1/4, 1/16, 1/64... 1/1024. now we add these terms, so if answer would be greater than 1/4 but, since the terms being added to 1/4 are very small, the answer would lie between 1/2 and 1/4, so I go for 'D'.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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