The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: if a 1 mm thick paper is folded so that the area is halved at every fold , then what would be the thickness of the pile after 50 folds ?
[EX A]: 1 billion km', 'e ) none'

[EX Q]: Problem: if p and q are both odd prime numbers andp < q , then how many different positive integer factors does 2 pqhave ?
[EX A]: 8

[EX Q]: Problem: in a group of 100 cars , 47 cars do not have air conditioning . if at least 55 cars have racing stripes , what is the greatest number of cars that could have air conditioning but not racing stripes ?
[EX A]:
45