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1,y+2,y+3,y+.....10,y=60
Muultumesc


Răspuns :

Inlocuiesti y cu 60
1,60+2,60+2,60+.....+10
1,62,63,64,....70
OBS.
1+2+3+...+n= [tex] \frac{n(n+1)}{2} [/tex]