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Bag A contains 6 white beads and 3 black beads.
Bag B contains 6 white beads and 4 black beads.
One bead is chosen at random from each bag.
Find the probability that
(1) both beads are black,
(il) at least one of the two beads is white.
The beads are not replaced.
A second bead is chosen at random from each bag.
Find the probability that
(iii) all four beads are white,