Question

Calcular a soma dos 14 primeiros termos da p.g (3,9,27...)

Answer 1

$An = A1 * (Q^{N - 1}) \\ An = 3 * (3^{14 - 1}) \\ An = 3 * 3^{13} \\ An = 3 * 1594323 \\ An = 4782969$


SN = A1 * ( Q^N - 1)/Q - 1
S14 = 3 * (3^14 - 1)/3 - 1
S14 = 3 * ( 4782969 - 1)/2
S14 = 3 * 4782968/2
S14 = 14348904/2
S14 = 7174452