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2 + 4 + 6 + ... + 2000
( Suma lui Agaus )


Răspuns :

2+4+6+....+2000=
=2(1+2+3+....+1000)=
=2x1000x1001:2=
=1000x1001=1.001.000
2x1+2x2+2x3+....+2x1000 =
=2x(1+2+3+....+1000) =
S=1000x1001=1001000