3) In a factory, there are 100 new cars produced. Three of the cars have serious defects. Ille quality control group is going to select 10 cars at random and check them thoroughly. (Each car has same probability than the others to get selected). If in the ten controlled cars they find at least one with a defect, they will control the whole group of 100. What is the probability that they will end up checking the whole bunch? (We assume that when they check a defect car, they always discover that the car is defect.)