<PRE><B>Question 951613</B>
A bag contains 6 red marbles, 7 white marbles, and 7 blue marbles. You draw 4 marbles out at random, without replacement.
 What is the probability that all the marbles are red?:: 6C4/20C4 = 0.0031 
----------------------------------------
 What is the probability that exactly two of the marbles are red?
6C2*14C2/20C4 = 0.2917 
----------------------------- 
What is the probability that none of the marbles are red?
14C4/20C4 = 0.2066
-------------
Cheers,
Stan H.
----------
 </PRE>