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1+3+5+7+...+2013=? Plus rezolvare

Răspuns :

1+3+5+7+....+2013=(2013+1)*(numarul de termeni)/2
numarul de termeni=(2013-1)/2+1=2012/2+1=1006+1=1007
(2013+1)*1007/2=2014*503,5=1014049