Question

1- Calcule a soma dos nove primeiros termos da PG (3, ,12,... ).

Answer 1

s = a1.(q^n - 1) / q-1

s = 3.(4⁹ - 1) / 4-1

s = 3.(4⁹ - 1) / 3

s = (4⁹ - 1)

s = 262143