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Calculati urmatoarele sume: 1+2+3+...........+47+48 .Dau coroana !!

Răspuns :

1+2+....+48=48*(48+1):2
=48*49:2=1176
1+2+3+.................+47+48=48*(48+1):2=48*49:2=24*49=1176(suma Gauss:n*(n+1):2 )