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20 Jul 2009, 20:38
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Hello to everybody,
Yesterday I was solving data sufficiency questions. I didn't understand the book's explanation for one of the questions. The question says that we have a set of 5 evenly spaced numbers, and asks for their sum.
The second statement tells us that two of these numbers are negative. Then the book explains that we don't know whether these two numbers are consecutive ones. It says that if we knew that, we could answer the question. I didn't understand the last part. I didn't think it was enough to know that two consecutive numbers were negative in order to answer the question. Can somebody explain please?
Thanks in advance!
Yesterday I was solving data sufficiency questions. I didn't understand the book's explanation for one of the questions. The question says that we have a set of 5 evenly spaced numbers, and asks for their sum.
The second statement tells us that two of these numbers are negative. Then the book explains that we don't know whether these two numbers are consecutive ones. It says that if we knew that, we could answer the question. I didn't understand the last part. I didn't think it was enough to know that two consecutive numbers were negative in order to answer the question. Can somebody explain please?
Thanks in advance!
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
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21 Jul 2009, 06:09
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kg7
-2,-1,0,1,2 is the ONLY case where you have 2 negative numbers being consecutive - so knowing there are only TWO negative numbers AND consecutive can solve the problem. IF they left the consecutive part out we could have: -10,-5,0,5,10 OR -5,-2,1,4,7 in which there are still two negatives BUT as you can see their sums are not consistent because they are not consecutive. So that's why consecutive is needed to get to the -2,-1,0,1,2 format.
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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