For clarification about the "total number of possible configurations in bits" here is a short summary.
Im sorry if the original description is confusing:
The Enigma cipher machine consists of five variable components:
1. a plugboard which could contain from zero to thirteen dual-wired cables
2. three ordered (left to right) rotors which wired twenty-six input contact points to twenty-six output contact points positioned on alternate faces of a disc
3. twenty-six serrations around the periphery of the rotors which allowed the operator to specify an initial rotational position for the rotors
4. a moveable ring on each of the rotors which controlled the rotational behavior of the rotor immediately to the left by means of a notch
5. a reflector half-rotor (which did not in fact rotate) to fold inputs and outputs back onto the same face of contact points
Your goal is to calculate the total number of possible configurations for such an Enigma machine,
where you can make your own rotors, etc.
And finally a hint: If you cant solve this part by yourself, google is your best friend