Question

Qual a soma dos termos da PA ( -2, 0, ..., 52)

Answer 1

Resposta:

Sn = $\frac{(a1 + an) . n}{2}$

S58 = $\frac{(- 2 + 52). 52}{2}$

S58 = $\frac{50 . 52}{2}$

S58 = $\frac{2600}{2}$

S58 = 1300