A bag contains 3 pink marbles, 5 blue marbles, and 3 red marbles. If 3 marbles are selected, what is the probability of picking 3 blue marbles?

There are LaTeX: \displaystyle C(11,3)=165 to select 3 marbles. There are LaTeX: \displaystyle 10 ways to select 3 blue from 5 blue. This gives the probability LaTeX: \displaystyle \frac{2}{33}