f(x) = 2x ∕3 f(x −1) ve f(6) =12 ise f(3) =?

f(6)=4f(5)=12
f(5)=3
f(5)=(10/3).f(4)=3
f(4)=9/10
f(4)=(8/3).f(3)=9/10
f(3)=27/80

f(6)=4f(5)
f(5)=(10/3)f(4)
f(4)=(8/3)(f3)
f(6)=(320/9).f(3)
f(3)=27/80