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Inca o intrebare! primul care raspunde are coroana :D

1+2+3+......+1999=?


Răspuns :

1+2+3+...+1999=
1999*2000=3998000
3998000/2=1999000
Gauss 1+2+..+n=n(n+1):2
1+2+3+......+1999=
=1999*2000:2
=1999*1000
=1999000