Respuesta :

[tex]\begin{gathered} \frac{40}{160}=\frac{10}{40}=\frac{2.5}{10} \\ \\ \frac{1}{4}=\frac{1}{4}=\frac{1}{4} \end{gathered}[/tex]

Since the ratio is constant through the sequence, we conclude that it is geometric sequence.

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