Respuesta :

a5904640

As we can see it's a geometric progression.


q = a2/a1

q = 1/3


so,


an = a1 . q^(n - 1)

an = 3 . (1/3)^(n - 1)


The one which matches is f(n) = 3 . (1/3)^(n - 1)


Alt C.