Respuesta :

[tex]a_{n}=9(-5)^{n-1} \\ \\ a_{1}=9*5^{1-1}=9 \\ \\ a_{1}=9 \\ \\r=-5 \\ a_{n}=-5a_{n-1} This is geometric sequence, correct answer is A. [/tex]
It should be the first one an = -5 (an -1), a1 =9

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