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[Post New]26 Jul 2007 22:14:26 IST
    Subject: Re:arithmetic progression
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garima_1211 (12)

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Olaaa!! Perrrfect answer. 2  [3 rates]
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group as (1-2),(3-4),(4-5) & so on
No. of terms now is n/2
The common difference is -1
Thus the sum is n/4(-2) =-n/2
 
 
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