Question

Care este suma 1/30+2/30+3/30+4/30+..........30/30=

Answer 1

[tex] \frac{1+2+3+.....+30}{30} = [/tex]
facem sus suma Gauss adică 1+2+3+....+30= $\frac{30*31}{2}$=465
apoi avem $\frac{465}{30} =15,5$