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'.

[EX Q]: Problem: how many odd 3 - digit integers greater than 800 are there such that all their digits are different ? 
Options: a ) 40 , b ) 56 , c ) 72 , d ) 81 , e ) 104
[EX A]: c

[EX Q]: Problem: how many numbers from 19 to 79 are exactly divisible by 11 ? 
Options: a ) 5 , b ) 6 , c ) 9 , d ) 11 , e ) 12
[EX A]: b

[EX Q]: Problem: the largest prime number is ? 
Options: a ) 11 , b ) 13 , c ) 5 , d ) 7 , e ) 9
[EX A]:
b