Answer:
A
Step-by-step explanation:
The recursive rule allows any term to be found by multiplying the previous term by the common ratio r
Here r = [tex]\frac{a_{2} }{a_{1} }[/tex] = [tex]\frac{20}{4}[/tex] = 5
Then
f(n) = 5 . f(n - 1) , for n ≥ 2 → A
