Question

calcule a soma dos seis primeiros termos da pg (2, 8,... )

Answer 1

S_n = a_1(q^n-1)/q-1

S_6 = 2(4^6-1) / 4-1

S_6 = 2(4096-1) / 3

S_6 = 2(4095) / 3

S_6 = 2730