One bag contains 4 white balls and 2 black balls.
Another contains 3 white balls and 5 black balls.
If one ball is drawn from each bag, find the probability that
. . (a) both are white
. . (b) one is white and one is black.
We have: .
(a) Both White.
(b) one W, one B
There are two scenariors:
. .  W from Bag 1, B from Bag 2: .
. .  B from Bag 1, W from Bag 2: .