Respuesta :

First sequence:

[tex]\begin{gathered} a_1=19 \\ a_n=a_1-12(n-1)=19-12n+1\Rightarrow a_n=20-12n \end{gathered}[/tex]

Second sequence:

[tex]\begin{gathered} a_1=5 \\ a_n=a_1\cdot4^{n-1}\Rightarrow a_n=5\cdot4^{n-1} \end{gathered}[/tex]

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