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T is the sum of the first 10 k

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by pops » Thu Jun 25, 2009 9:14 pm
I am not able to understand the question. Can you make it clearer please.
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by shibal » Sat Jun 27, 2009 6:59 am
here it goes....
(-1)^k+1(½k). T is the sum of the first 10 k, is t:
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by DanaJ » Sat Jun 27, 2009 8:40 am
This is a GMATprep question. Note that all such questions have been discussed before, so doing a quick search of some keywords will surely yield a solution:

https://www.beatthegmat.com/gmat-prep-qu ... 21502.html

https://www.beatthegmat.com/sequence-exp ... 31657.html
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