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va roggg⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡⚡


Va Roggg class=

Răspuns :

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