Suppose I have a function
F[r_]:= A/r + B/r^2 + Conjugate[C]/r^3
with A, B, C being complex numbers and r being a real variable. I would like to series expand
in powers of inverse r. How do I tell mathematica to treat A, B, and C as complex numbers while r as a real variable? Can I do this when defining the function F[r]? Can I do this while using Series ? Which is the shortest way to do this?