Answer:
an = [tex]2^{n-3}[/tex]
Step-by-step explanation:
Explicit rule for Geometric series is given by
[tex]a_n = ar^{n-1}[/tex]
Here a is the first term and r is the common ratio.
in our question first term a = [tex]\frac{1}{4}[/tex]
common ratio r = 2
therefore explicit rule an = [tex]\frac{1}{4} 2^{n-1}[/tex]
or
an= [tex]2^{n-3}[/tex]
