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Calculati suma 1+2+3+4+5+...+50

Răspuns :

S=(50+1) *50 /2= 51*50 /2=2550/2=1275
[tex]\displaystyle 1+2+3+4+5+...+50= \frac{50(50+1)}{2} = \frac{50 \times 51}{2} = \frac{2550}{2} =1275[/tex]