Question

determine o decimo segundo termo da P.G(1/16,1/8,1/4,...)

Answer 1

Sabemos que:

q = a2/a1
an = ak.q^(n-k)

Logo:

q = (1/8)/(1/16)
q = (1/8).(16/1)
q = 16/8
q = 2

a12 = a1.q^(12 - 1)
a12 = (1/16).2¹¹
a12 = (1/16).2048
a12 = 2048/16
a12 = 128