Feature Diagram
For the given feature diagram I have to say how many different products exist in this products family?
(black circle means mandatory, halfcircle black on the branches means or but at least one and the halfcircle white means only one)

So I assume the answer is 216 but im not sure about it .
My explanantion:
Current speed 1
Comfort (weather=2^3-1 options * Navi=2* Gear =1 )^3 -1 = 216

Would also appreciate if you have tipps how I can solve that kind exercises generally.