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**1. Homework Statement**

A bag contains 40 blue marbles, 40 red marbles, 20 green marbles. 60 of the marbles are big. Three marbles are selected without replacement.

What is the probability of randomly selecting three big blue marbles?

**2. Homework Equations**

p(x,y/theta=p(x)p(y/x)=p(y)p(x/y)

**3. The Attempt at a Solution**

(40/60)(39/59)(38/58)/(40/100)(39/99)(38/98)