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Evaluate the limit as n trnds to infinity

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0 votes
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in Limit, continuity and differentiability by (100 points)

lim1+2+3+....n/(1-n2)

n→infinity 

by (20 points)
Is the final answer 1/2?
1+2+3+..+n =[ n*(n+1)]/2
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1 Answer

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by (15 points)
it should be  (-1/2)

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