Question

1+2+3+.........100(repede am nevoie ,dau coroana)

Answer 1

1+2+3+++100=
100x101:2=
10100:2=5050

Answer 2

$Suma~ Gauss$
$S=1+2+3+...+n=n (n+1):2$
$S=100* (100+1) :2$
$S=100*101:2$
$S=50*101$
$\boxed{S=5050}$