Task: Question Answering
Input (English): Problem: in a class of 78 students 41 are taking french , 22 are taking german . of the students taking french or german , 9 are taking both courses . how many students are not enrolled in either course ? 
Options: a ) 26 , b ) 27 , c ) 24 , d ) 18 , e ) 11
Output (English): c