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tough DS.

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by gabriel » Thu Oct 04, 2007 4:26 am
tridip wrote:The sequence of a1,a2,a3.........an of n integers is such that ak=k.If k is odd & an=-ak-1 if k is even.Is the sum of the terms in the sequence positive??

A-- n is odd.

B-- an is positive..

I dont have any idea how to solve this math.plss help..
Have a feeling that there is something wrong with the question ... check it once again...
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