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1+3+5+7+...+103
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Răspuns :

1+3+5+7+...+103=(1+2*0)+(1+2*1)+(1+2*2)+(1+2*3)+...+(1+2*51)=52+2*(1+2+3+...+51)=52+2*51*52/2=52+51*52=52^2=2704.