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cat face 1+2+3....+48+49+50

Răspuns :

Formula lui Gaus, 50×51:2=2550:2=1275
[tex]1+2+3+...+n = \frac{n*(n+1)}{2} \\ =\ \textgreater \ 1+2+3+...+49+50 = \frac{50*51}{2} = \frac{2550}{2} = 1275. [/tex]