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b= 1 plu 3 plus 5 plus... plus 2013

Răspuns :

b = 1 + 3 + 5 + ...+ 2013
(2013+1) : 2 = 1007 termeni
b = (2013 + 1) × 1007 : 2
b = 2014 × 1007:2
b = 1007^2