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# Concept of evenly spaced numbers

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Intern
Joined: 10 Jul 2009
Posts: 2
Concept of evenly spaced numbers  [#permalink]

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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?

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Current Student
Joined: 12 Jun 2009
Posts: 1782
Location: United States (NC)
Concentration: Strategy, Finance
Schools: UNC (Kenan-Flagler) - Class of 2013
GMAT 1: 720 Q49 V39
WE: Programming (Computer Software)
Re: Concept of evenly spaced numbers  [#permalink]

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21 Jul 2009, 06:09
kg7 wrote:
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?

-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.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Re: Concept of evenly spaced numbers &nbs [#permalink] 21 Jul 2009, 06:09
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