You will be given a definition of a task first, then some input of the task.
In this task, you need to provide the correct option for a given problem on probability from the provided options.

Problem: an urn contains 5 red , 6 blue and 8 green balls . 4 balls are randomly selected from the urn , find the probability that the drawn ball are 1 blue and 2 red and 1 green balls ? 
Options: a ) 20 / 323 , b ) 40 / 323 , c ) 60 / 273 , d ) 50 / 373 , e ) 40 / 373
Output:
b