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1+2+3+4+5.............+2004

Răspuns :

se apica formula lui gauss
2004(2004+1):2=
=2004x2005:2=2009010
S= [tex] \frac{(1+n)*n}{2} = \frac{(1+2004)*2004}{2} = \frac{2005*2004}{2} = 2005*1002[/tex]