Question

0,1,2,3.......,19. Suma lui Gaus 55 pt

Answer 1

$s = \frac{n(n + 1)}{2} \\ \\ s = \frac{19(19 + 1)}{2} \\ \\ s = \frac{19 \times 20}{2} \\ \\ s = \frac{380}{2} \\ \\ s = 190$