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3+6+9+………+252, suma Gauss dau coroana !!!!!

Răspuns :

Răspuns:

3+6+9+………+252=3(1+2+3+....+84)=3(84·85)/2=3·3570=10710

3+6+9+....+252=3(1+2+3+....+84)

3=3(84×85)/2=3×3570=10710