Question

1+2+3+...+1199+1200 va rog mult

Answer 1

Suma Gauss

1200 = n
Dupa regula se afla [n*(n+1)]/2
1200x1201/2
1441200 /2
720600

Answer 2

$\text{Foloseste formula:} \\ \\ \boxed{\frac{n(n+1)}{2} } \ n \ este \ ultimul \ numar \ din \ sir \\ \\ \\\frac{1200(1200+1)}{2} = \frac{1200*1201}{2} =600*1201=720600$