Answer:
Hence, All integers where n ≥ 1
Option 2 is correct.
Step-by-step explanation:
Given: The geometric sequence
where, a1 = a = 5 and the common ratio (r) = −3
Now we will find the general term of Geometric sequence.
[tex]a_n=ar^{n-1}[/tex]
[tex]a_n=5(-3)^{n-1}[/tex]
Now we write as function,
[tex]f(n)=5(-3)^{n-1}[/tex]
f(1)=5
For n=1,
Geometric series start from n=1
Therefore, Domain: n≥1
Hence, All integers where n ≥ 1
