Task: Question Answering
Input (English): Problem: ( ( ( 13 ! ) ^ 16 ) - ( ( 13 ! ) ^ 8 ) ) / ( ( ( 13 ! ) ^ 8 ) + ( ( 13 ! ) ^ 4 ) ) = a then what is the units digit for a / ( ( 13 ! ) ^ 4 ) = 
Options: a ) 7 , b ) 8 , c ) 9 , d ) 6 , e ) 5
Output (English): c