Question 459221
a bag contains 3 red discs, 4 black discs and 5 yellow discs. 2 discs are picked one after the other without replacement. Find the probability that
a) the first disc is black and the second is red:::(4/12)(3/11)
--------------------
b) the first and second discs are yellow:::(5/12)(4/11)
--------------------
c) the first is red and e second is yellow:::(3/12)(5/11)
=============
Cheers,
Stan H.
=============