In this task, you need to provide the correct option for a given problem on probability from the provided options.

Input: Consider Input: Problem: if two dice are thrown together , the probability of getting an even prime number on the dice is 
Options: a ) 1 / 36 , b ) 1 / 18 , c ) 1 / 13 , d ) 1 / 9 , e ) 5 / 36

Output: a


Input: Consider Input: Problem: there are 6 books on a shelf , of which 2 are paperbacks and 4 are hardbacks . how many possible selections of 4 books from this shelf include at least one paperback ? 
Options: a ) a ) 40 , b ) b ) 14 , c ) c ) 50 , d ) d ) 55 , e ) e ) 60

Output: b


Input: Consider Input: Problem: there are 21 students in a class . in how many different ways can a committee of 3 students be formed ? 
Options: a ) 1180 , b ) 1330 , c ) 1540 , d ) 1760 , e ) 1920


Output: b