va roggg⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡
![Va Roggg class=](https://ro-static.z-dn.net/files/d51/6b75e7f5c64a614bb2ac70dbfeb47a38.jpg)
Răspuns:
S=7+14+21+...+840
S=7·(1+2+3+..+120)
S=7·[120·(120+1)/2]
S=7·(120·121/2)
S=7·7260
S=50820