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

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

Problem: how many different ways can 2 students be seated in a row of 6 desks , so that there is always at least one empty desk between the students ?
Options: a ) 2 , b ) 3 , c ) 4 , d ) 20 , e ) 12
d

Problem: a card is drawn from a pack of 52 cards . the probability of getting a queen of spade or an ace of club is :
Options: a ) 1 / 13 , b ) 1 / 26 , c ) 2 / 13 , d ) 1 / 52 , e ) 1 / 48
b