Question

quanto vale a soma dos 350 termos da p.a (3,10,...)?

Answer 1

An= a1 + (n-1) q
Sn= (a1 +an) n/ 2

A(350)= 3 + (350-1) 7
A(350)= 2446

S(350)= (3 + 2446) 350/2
S(350)= 2449.175= 428575