Question

Calcular a soma dos termos do P.A.(-16, - 14, -12, ...,84)

Answer 1

n= an-a1/r + 1 = 84+16/2 + 1 = 50 + 1 = 51

s=(a1+an/2).n =(84-16/2).51=(34).51 =1734 ✓