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2011 | (1+2+3+...+2010)

Răspuns :

Folosim formula sumei lui Gauss
1+2+3+...+2010=2010*2011/2=1005*2011
2011 divide orice produs al nr 2011 cu alt numar
rezulta ca 2011 divide 1+2+3+...+2010
2011 | (2010×2011):2
2011 | 2,021,055