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

[EX Q]: Problem: from a pack of 52 cards , 1 card is drawn at random . what is the probability that a red king is drawn ? 
Options: a ) 1 / 2 , b ) 1 / 4 , c ) 1 / 13 , d ) 1 / 26 , e ) 1 / 52
[EX A]: d

[EX Q]: Problem: there are 10 students named alphabetically from a to j . what is the probability that a and d do not sit together if all 10 sit around a circular table ? 
Options: a ) 2 / 9 , b ) 2 / 5 , c ) 7 / 9 , d ) 4 / 5 , e ) 8 / 9
[EX A]: c

[EX Q]: Problem: three unbiased coins are tossed , what is the probability of getting at least 2 tails ? 
Options: a ) 1 / 5 , b ) 1 / 7 , c ) 1 / 8 , d ) 1 / 2 , e ) 1 / 10
[EX A]:
d