You randomly withdraw 3 balls out of a lot containing identical red, identical green and identical blue balls. What is the probability that you get 1 red, 1 green and 1 blue ball given the number of

a) Red balls = 3, Green balls = 3, Blue balls = 3

b) Red balls = p, Green balls = q, Blue balls = r such that p,q,r>3

c) Red balls = infinity, Green balls = infinity, Blue balls = infinity

a) Red balls = 3, Green balls = 3, Blue balls = 3

b) Red balls = p, Green balls = q, Blue balls = r such that p,q,r>3

c) Red balls = infinity, Green balls = infinity, Blue balls = infinity