In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[Q]: Problem: find the smallest positive integer n such that 11 n - 1 is divisible by 105 . 
Options: a ) 3 , b ) 4 , c ) 5 , d ) 6 , e ) 7
[A]: d


[Q]: Problem: 12.1212 + 17.0005 - 9.1103 = ? 
Options: a ) 20.0015 , b ) 20.0105 , c ) 20.0115 , d ) 20.0114 , e ) none
[A]: d


[Q]: Problem: if 9 / ( 5 + 3 / x ) = 1 , then x = 
Options: a ) 3 , b ) 1 , c ) 3 / 4 , d ) - 1 / 3 , e ) - 3
[A]:
c