Answer:
81
Step-by-step explanation:
The recursive function is given as:
f(n+1)=1/3f(n)
So then we multiply both sides by 3:
3f(n+1)=f(n)
Then we set n=2:
3f(2+1)=f(2)
Which comes to be:
f(2)=3f(3)
Next we set n=1:
f(1)=3f(1+1)
Which is:
f(1)=3f(2)
Then we substitute:
f(1)=3*3f(3)
=9f(3)
=9*9
=81
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