Question

numa PG A1 = -1/5 e q = 1 calcule a soma dos 40 primeiros termos dessa PG​

Answer 1

Sn = a₁ * (qⁿ - 1) / q - 1

S₄₀ = - 1/5 * ( 1⁴⁰ - 1 ) / 1 - 1

S₄₀ = - 1/5 * ( 1 - 1) / 0

S₄₀ = - 1/5 * 0 / 0

S₄₀ = 0 / 0

S₄₀ = 0