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7+9+11+13+....+2011-6-8-10-12-....2010

Răspuns :

S = 7 + 9 + 11 + 13+....+2011- 6- 8-10 -12 -....2010
se grupeaza termenii cate 2:

S = (7 - 6) + (9 - 8)+..........+(2011 - 2010) = 1×1002 = 1002