Respuesta :

gmany

Answer:

4th: 12

Step-by-step explanation:

[tex]a_1=\dfrac{4}{9}\\\\a_2=\dfrac{4}{9}\cdot3=\dfrac{4}{3}\\\\a_3=\dfrac{4}{3}\cdot3=4\\\\a_4=4\cdot3=12\\\vdots\\\\a_n=\dfrac{4}{9}\cdot3^{n-1}[/tex]