<PRE><B>Question 955662</B>
An urn contains 6 red marbles and 4 black marbles. Two marbles are drawn without replacement from the urn. What is the probability that both of the marbles are black? 
-----
# of ways to succeed: 4C2 = 6
# of possible pairs:: 10C2 = 45
---
P(2 black) = 6/45 = 2/15
----------------
Cheers,
Stan H.
---------</PRE>