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1+1/3+1/3^2+...+1/3^1999

Răspuns :

s=1+1/3+1/3^2+....................+1/3^1999

s/3=1/3+1/3^2+1/3^3+........+1/3^2000

s-s/3=1 - 1/3^2000

s(1-1/3)=1 - 1/3^2000

s=3(1-1/3^2000)/2