Question

Qual a soma dos números inteiros de 1 a 350

Answer 1

An=a1+(n-1).r
350=1+(n-1).1
350-1=n-1
350-1+1=n
n=350
Sn=(a1+an).n/2
S350=(1+350).350/2
S350=351.350/2
S350=351.175
S350=61.425