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

Ex Input:
Problem: a bag consists of 20 marbles , of which 5 are blue , 9 are red , and the remainder are white . if lisa is to select a marble from the bag at random , what is the probability that the marble will be red or white ?
Options: a ) 3 / 4 , b ) 2 / 4 , c ) 1 / 4 , d ) 1 / 8 , e ) 1 / 16

Ex Output:
a

Ex Input:
Problem: a meeting has to be conducted with 5 managers . find the number of ways in which the managers may be selected from among 7 managers , if there are 2 managers who refuse to attend the meeting together .
Options: a ) 6 , b ) 8 , c ) 10 , d ) 11 , e ) 15

Ex Output:
d

Ex Input:
Problem: three 6 faced dice are thrown together . the probability that all the three show the same number on them is -
Options: a ) 1 / 39 , b ) 1 / 36 , c ) 1 / 32 , d ) 1 / 31 , e ) 1 / 30

Ex Output:
b