A survey on a sample of 25 new cars being sold at a local auto dealer was conducted to see three popular options-air conditioning, radio and power windows-which were
already installed. The survey found that 15 had air conditioning, 2 had air conditioning and power windows but no radios, 12 had radio, 6 had air conditioning and radio but no power windows, 11 had power windows, 4 had radio and power windows, 3 had all three options.
What is the number of cars that had none of the options?