A car company carried out a survey on the twenty five new cars being sold at a dealer's showroom in order to check if the cars were installed with air conditioning, music player and power windows. Following are some points that were accumulated over the survey.
a) 15 cars had air conditioning.
b) 2 cars had air conditioning and power windows but no music player.
c) 12 cars had music player
d) 6 cars had air conditioning and music player but no power windows were present
e) 11 cars had power windows
f) 1 car had music player and power windows but no air conditioning
g) 3 cars had all the three things installed
How many cars have none of the things installed?
How many cars have only one of the three things installed?