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

Problem: there are 10 books on a shelf , of which 4 are paperbacks and 6 are hardbacks . how many possible selections of 5 books from the shelf contain at least one paperback and at least one hardback ? 
Options: a ) 75 , b ) 120 , c ) 210 , d ) 246 , e ) 252
d

Problem: in a throw of dice what is the probability of ge æ « ng number greater than 2 
Options: a ) 1 / 2 , b ) 2 / 3 , c ) 1 / 5 , d ) 1 / 6 , e ) none of these
b

Problem: three unbiased coins are tossed . what is the probability of getting at most two heads ? 
Options: a ) 3 / 4 , b ) 1 / 4 , c ) 3 / 8 , d ) 7 / 8 , e ) none of these

d