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'.

Problem: in a division , a student took 72 as divisor instead of 36 . his answer was 24 . the correct answer is -
Options: a ) 42 , b ) 32 , c ) 48 , d ) 28 , e ) 38
c

Problem: if n is an integer , f ( n ) = f ( n - 1 ) - n and f ( 4 ) = 14 . what is the value of f ( 6 ) ?
Options: a ) 3 , b ) 0 , c ) 1 , d ) 2 , e ) 4
a

Problem: 3 , 14,39 , _ ?
Options: a ) 81 , b ) 82 , c ) 83 , d ) 84 , e ) 85
d