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suma numerelor naturale care impartite la 7 dau catul 5 ???


Răspuns :

n : 7 = 5 + r ∈ {0,1,2,3,4,5,6}
n=7*5+r=35+r
n∈{35,36,37,38,39,40,41}
S=35+36+37+38+39+40+41=266