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help please

 Nov 30, 2020
 #1
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Using arithmetico-geometric series, S = -1004.  In mod 2010, this is 2010 - 1004 = 1006.

 Nov 30, 2020
 #2
avatar+467 
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incorrect

 Nov 30, 2020
 #3
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∑[ (-1)^(n+1) * n, n, 1, 2010] =-1005

 

-1005 mod 2010 = - 1005

 

2010 + (- 1005) = 1005

 Nov 30, 2020

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