A coil of inductive reactance `31Omega` has a resistance of `8Omega` . It is placed in series with a condenser of copacitive reactance `25Omega` . The combination is connected to an a.c. source of 110 volt. The power factor of the circuit is.
Options:
(a) 0.80
(b) 0.33
(c) 0.56
(d) 0.64